Railway Signaling | S

NOTE:

Although all of these digitized articles are 60 or more years old, and likely have minimal commercial value today, the reader should bear in mind that material dated after 1923 remains under copyright by Simmons-Boardman Publishing.

These articles and the information contained therein may be freely reproduced or used in printed or electronic form for non-commercial or educational purposes, provided the copyright holder and original author (if known) are acknowledged, and provided that such publication also refers readers to the original document on this site.

Simply making interesting material available to those who share my interest in the railway signal systems of the past has been my sole objective in this long project.

Learn more about this collection.

"S" markers 8

1943	Centralized Traffic Control Installed On 64.6 Miles of the Seaboard 7.1 MB
1944	CTC On 185 Miles on Canadian National 12.3 MB
1944	CTC Speeds Ore Traffic On the DM&IR 4.6 MB
1951	Double to Single Track 60 Miles on the Erie 1.1 MB
1940	Entering the Main Line 1.3 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1944	Signals Direct Trains at Junction On the Denver & Rio Grande Western and the Denver & Salt Lake 2.8 MB
1958	Subway consolidates interlockings 2.2 MB

"SH" interlocking, Madison, IL 1

1955	Crossing gate protection with indicators for train movements 432.4 KB

"SW" Tower, WV 1

1965	B&O would have used radio orders 565.5 KB

's Hertogenbosch 1

1951	New Interlocking in Holland 1.0 MB

Sabula, IA 1

1927	Comparative Maintenance Costs of Signaling on the CM&StP 2.9 MB

Sacramento Northern 3

1939	Cab Signaling and Train Control On the San Francisco-Oakland Bay Bridge 7.2 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB

Sacramento, CA 4

1962	Automatic Dispatching 2.1 MB
1962	News briefs. 1962-02 1.4 MB
1964	News briefs. 1964-04 1.3 MB
1922	News of the Month. 1922-09 562.2 KB

Saginaw, MI 5

1958	C&O Has Good Ideas in CTC 2.5 MB
1955	CTC Saves Time for Freights On 135 Miles of Single Track 4.0 MB
1960	News briefs. 1960-07 845.4 KB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-10 1.1 MB

Salamanca, NY 1

1929	Erie Equips Complete Division with Signals and Interlockers 3.9 MB

Salem, IL 1

1962	News briefs. 1962-06 989.1 KB

Salem, MA 2

1958	B&M goes underground 725.7 KB
1959	B&M takes up track and installs traffic control, gates and flashers 735.7 KB

Salem, VA 1

1950	Neon Lighting For Crossing Gate Arms 3.1 MB

Salida, CO 1

1961	News briefs. 1961-04 1.5 MB

Salina, KS 1

1935	Safety of High Speed Trains 5.2 MB

Salinas, CA 1

1962	News briefs. 1962-09 838.3 KB

Salisbury, MO 1

1955	News briefs. 1955-08 830.4 KB

Salisbury, NC 2

1965	News briefs. 1965-08 749.4 KB
1966	News briefs. 1966-01 1.4 MB

Salkehatchie, SC 1

1964	News briefs. 1964-05 1.0 MB

Sallisaw, OK 1

1961	News briefs. 1961-02 1.4 MB

Salt Lake City, UT 4

1949	625 Miles of CTC in one Stretch 7.9 MB
1937	CTC On the Denver & Rio Grande Western 8.0 MB
1954	Electric Interlocking on the Rio Grande 3.4 MB
1943	Union Pacific Installs CTC on 175 Miles of Single Track 13.2 MB

San Antonio, TX 4

1962	Centralization – Dispatch Circuits Are Changing 1.3 MB
1954	CTC Improves Train Operation 3.3 MB
1965	GCPs can be used for various types of grade crossings 369.4 KB
1948	New Signaling In Texas on Missouri Pacific Lines 1.8 MB

San Bernardino, CA 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

San Diego & Arizona 1

1922	News of the Month. 1922-01 315.5 KB

San Diego, CA 2

1947	ICC Holds Signal Hearing 507.5 KB
1944	Santa Fe Installs CTC on 115.6 Miles Los Angeles to San Diego 7.2 MB

San Francisco Bay Area Rapid Transit 2

1965	AFO circuits can be used in subways 676.7 KB
1965	Japan, Sweden, England test ATO 6.3 MB

San Francisco, CA 12

1965	AFO circuits can be used in subways 676.7 KB
1939	Cab Signaling and Train Control On the San Francisco-Oakland Bay Bridge 7.2 MB
1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB
1915	Electro-Pneumatic Plant at San Francisco 2.4 MB
1947	ICC Holds Signal Hearing 507.5 KB
1937	Illumination as a Type of Crossing Protection 3.0 MB
1959	News briefs. 1959-05 506.5 KB
1964	News briefs. 1964-04 1.3 MB
1935	Safety of High Speed Trains 5.2 MB
1964	San Francisco will test four ATO systems 1.4 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB

San Francisco-Oakland 1

1922	Automatic Train Control in Use On American Railroads 353.7 KB

San Francisco-Oakland Bay Bridge 4

1939	Cab Signaling and Train Control On the San Francisco-Oakland Bay Bridge 7.2 MB
1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB

San Jose, CA 4

1935	Depression Operation of Interlocking 2.6 MB
1922	News of the Month. 1922-02 323.2 KB
1962	Remote Control Interlocking Has Time Division Multiplex System 846.3 KB
1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB

San Marcos, TX 1

1949	New Automatic Block on the Katy 4.7 MB

Sandpoint, ID 2

1963	News briefs. 1963-03 790.6 KB
1965	News briefs. 1965-01 2.0 MB

Sandusky, OH 2

1946	Drawbridge Interlocking on the New York Central 3.1 MB
1965	News briefs. 1965-01 2.0 MB

Santa Ana, CA 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Santa Clara, CA 1

1962	Remote Control Interlocking Has Time Division Multiplex System 846.3 KB

Santa Fe Jct., Kansas City, MO 1

1956	New Three-Track Interchange Includes Interlocking and Talk-Backs 8.9 MB

Santa Fe Street, Kansas City, MO 1

1949	Entrance-Exit Interlocking Installed on Missouri Pacific 3.0 MB

Santo, TX 1

1960	T&P moves CTC machine 78 miles 423.0 KB

Sapulpa, OK 1

1929	Frisco Installs Semaphores with Color-Light Indication 665.1 KB

Saratoga Springs, NY 1

1955	News briefs. 1955-08 830.4 KB

Saskatoon, Saskatchewan 2

1962	News briefs. 1962-07 494.2 KB
1964	News briefs. 1964-01 535.9 KB

Savanna, GA 1

1955	News briefs. 1955-08 830.4 KB

Savanna, IL 5

1943	Centralized Traffic Control Installed on 39 Miles of the Burlington 6.1 MB
1927	Comparative Maintenance Costs of Signaling on the CM&StP 2.9 MB
1964	Milwaukee installs its first microwave 277.4 KB
1947	More CTC on the Burlington 2.0 MB
1963	News briefs. 1963-01 951.3 KB

Savannah, GA 4

1947	Annual Review and Outlook 404.7 KB
1943	Centralized Traffic Control Installed On 64.6 Miles of the Seaboard 7.1 MB
1926	Signal Business Is Good Especially For Single Track 382.3 KB
1944	Track Circuits on Passing Tracks in CTC Territory 941.8 KB

Sawmills, Rhodesia 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

Sawmills, Zimbabwe 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

Saxby & Farmer 4

1915	Electric Train Staff Installation 3.3 MB
1920	Largest Saxby & Farmer Machine in the United States 1.6 MB
1951	Pennsylvania Exhibits Speed Control 512.5 KB
1936	T. George Stiles Rounds Out 60 Years of Signaling 2.5 MB

Saxby & Farmer machine 1

1910	Electric Interlocking at Griffith, Indiana 964.1 KB

Saxton, MO 1

1922	News of the Month. 1922-07 346.9 KB

Sayre, PA 2

1962	News briefs. 1962-04 1.2 MB
1963	News briefs. 1963-05 720.2 KB

São Paulo, Brazil 1

1961	Brazilian Automated CTC Will Make Meets 1.2 MB

Scales Mound, IL 1

1942	Automatic Signal Program on the Illinois Central 4.6 MB

Scarboro, Ontario 1

1960	CNR uses speed selection for gates 980.7 KB

scheduling 1

1940	Make-Up-Time Chart 813.1 KB

Schenectady, NY 5

1947	Hoosac Tunnel Interlocking and CTC 1.7 MB
1960	News briefs. 1960-01 1.1 MB
1960	News briefs. 1960-03 1.9 MB
1961	News briefs. 1961-01 761.9 KB
1961	News briefs. 1961-07 648.9 KB

Schenevis, NY 1

1922	News of the Month. 1922-09 562.2 KB

Schiller Park, IL 4

1962	News briefs. 1962-02 1.4 MB
1963	News briefs. 1963-10 497.4 KB
1965	News briefs. 1965-10 1.1 MB
1933	Remote Control on Soo Line 2.7 MB

Schoharie Jct., NY 1

1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Schreiber, Ontario 1

1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB

Schuylkill Haven, PA 1

1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Schuylkill River drawbridge, Philadelphia, PA 1

1961	Railroad Will Pay For CTC Out Of Accrued Savings 842.9 KB

Schwendt, B. J. 6

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1926	B. J Schwendt 438.9 KB
1937	Changes on the New York Central Lines 2.3 MB
1927	NYC First to Install Complete Train Dispatching System 8.0 MB
1950	Obituary: B. J. Schwendt 966.4 KB
1941	Simplified Signaling 426.9 KB

Scotia West, NY 1

1955	CTC reduces operating expenses 431.8 KB

Scotland 1

1915	Rule 55 and the Gretna Accident 1.8 MB

Scott Street, Toronto, Ontario 1

1931	Interlocking System Installed at Toronto Union Station 4.6 MB

Scranton, PA 4

1960	News briefs. 1960-03 1.9 MB
1961	News briefs. 1961-07 648.9 KB
1964	News briefs. 1964-09 879.4 KB
1965	News briefs. 1965-02 1.9 MB

Scribner, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Seaboard Air Line 41

1947	Annual Review and Outlook 404.7 KB
1928	Automatic Signals Within Yard Limits 1.0 MB
1950	Big NX Interlocking at Atlanta 6.3 MB
1943	Centralized Traffic Control Installed On 64.6 Miles of the Seaboard 7.1 MB
1938	Clearing of Signals at Automatic Interlockings 2.2 MB
1959	CTC discussed at AIEE meeting 445.2 KB
1950	CTC Indication Code 1.2 MB
1954	CTC into Service 2.5 MB
1962	Hotbox Detectors Talk 2.0 MB
1956	How to Get Maximum Capacity of Single Track 10.5 MB
1935	Installation of Bond Wires 4.0 MB
1937	Location of Signals at Spring Switches 1.3 MB
1929	Marker Lights on Automatic Signals 994.2 KB
1957	More automation for signaling in 1957 1.2 MB
1955	Much is new in signaling for 1955 826.7 KB
1921	New Interlockings at Jacksonville Terminal 3.4 MB
1960	News briefs. 1960-06 1.2 MB
1961	News briefs. 1961-04 1.5 MB
1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-04 1.2 MB
1962	News briefs. 1962-09 838.3 KB
1963	News briefs. 1963-11 1.4 MB
1964	News briefs. 1964-08 811.5 KB
1964	News briefs. 1964-11 797.3 KB
1965	News briefs. 1965-10 1.1 MB
1935	Night Check of Signal Lights 1.2 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1929	Rear-End Flagging 745.4 KB
1935	Remote Control on the Seaboard 5.4 MB
1935	Removal of Switch Indicators 2.3 MB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB
1937	Seaboard Utilizes Spring Switches 8.4 MB
1926	Semaphore or Light Signals? 711.2 KB
1928	Signal and Train Control Hearing Ends 2.0 MB
1926	Signal Business Is Good Especially For Single Track 382.3 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1927	Signaling Special Layouts 4.1 MB
1961	Survey Tells How Railroads Use Hotbox Detectors 1.8 MB
1932	Take-Siding Signals 318.1 KB
1944	Track Circuits on Passing Tracks in CTC Territory 941.8 KB
1928	Why Markers for Automatic Signals? 494.6 KB

Seaboard Air Lines 1

1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB

searchlight dwarf signal 1

1955	News briefs. 1955-08 830.4 KB

searchlight signals 66

1921	A New Light Signal 1.4 MB
1956	Aligning Searchlight Signal 1.1 MB
1934	An Electric Interlocking on the Southern Pacific 1.8 MB
1947	Automatic Block With Spring Switches installed on the Georgia Railroad 851.4 KB
1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1935	Avoiding Light-Out Signal Failures 1.2 MB
1958	B&M goes underground 725.7 KB
1959	B&M takes up track and installs traffic control, gates and flashers 735.7 KB
1939	Burlington Replaces Semaphores With Color Lights 3.4 MB
1947	Canadian Pacific Installs Absolute Permissive Block 774.8 KB
1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB
1943	Centralized Traffic Control Installed on 39 Miles of the Burlington 6.1 MB
1943	Centralized Traffic Control on the Milwaukee 2.8 MB
1949	Coast Line Replaces Signaling On Engine District 8.1 MB
1958	CP consolidates interlockings 2.0 MB
1947	CTC Down by the Ohio 2.7 MB
1955	CTC enables P&LE to remove fourth main track 515.3 KB
1947	CTC Has Long Sidings With Signals on the Santa Fe 2.1 MB
1954	CTC Improves Train Operation 3.3 MB
1950	CTC Installed on 128 Miles of NKP 12.1 MB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1943	CTC on the Bessemer & Lake Erie 8.7 MB
1937	CTC On the Denver & Rio Grande Western 8.0 MB
1958	CTC saves time and money for the Louisville & Nashville 446.6 KB
1947	Drawbridge Interlocking on the Elgin, Joliet & Eastern 647.3 KB
1957	GN CTC's 175 miles of mainline 635.9 KB
1947	Hoosac Tunnel Interlocking and CTC 1.7 MB
1957	How to make non-stop meet with CTC 576.9 KB
1939	Improved Searchlight Signal 3.3 MB
1936	Interlocking and Remote Control on Erie 18.9 MB
1947	Large All-Relay Interlocking on the New York Central 2.5 MB
1944	Light-Type Signals Installed on the Reading 6.3 MB
1954	Loudspeakers and Interlocking Improve Yard Operation 4.7 MB
1947	Milwaukee Installs Block System on 98 Miles 1.2 MB
1947	Modern Interlocking Applied to Ore Transportation 1.1 MB
1943	Modernization of Automatic Signaling On the New York Central 9.8 MB
1935	Multiple Aspect Signaling 3.3 MB
1944	New All-Relay Interlocking at Providence, RI on the New Haven 5.8 MB
1949	New Automatic Block on the Katy 4.7 MB
1937	New Devices- March 1937 18.1 MB
1951	New Interlocking in Holland 1.0 MB
1940	New Searchlight Signal 2.7 MB
1935	New Signaling on the Route of the C&NW "400" 9.6 MB
1940	New Signaling on the Wabash 8.1 MB
1944	New York Central Installs Coded Track Circuits 3.9 MB
1964	News briefs. 1964-06 812.0 KB
1964	News briefs. 1964-07 833.0 KB
1958	Nine layouts in one interlocking 1.7 MB
1954	NYC Combines Interlockings 2.4 MB
1959	P&LE installs multiple track CTC 1.1 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1939	Plug Connector for "H-2" Searchlight Signals 1.1 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1935	Repeating Reverse Signal Indication 2.9 MB
1959	Santa Fe CTCs double track line 2.2 MB
1955	Santa Fe installs CTC on single track 610.2 KB
1957	Seaway diverts CN mainline 532.3 KB
1937	Signal Construction on the Wabash 12.2 MB
1947	Signaling and Interlocking in Italy 684.8 KB
1944	Signaling Modernized On the Pittsburgh & Lake Erie 4.7 MB
1937	Signaling on the Wabash 3.7 MB
1947	Southern Pacific Installs CTC 990.2 KB
1954	SP Modernizes Automatic Block 2.0 MB
1947	The New Haven Installs All-Relay Interlocking at Providence, RI 1.9 MB
1961	Type SA-1 Searchlight Signal 189.5 KB
1960	What's the answer? Dwarf signals 511.5 KB

Searcy, AL 1

1965	News briefs. 1965-05 1.4 MB

Seattle monorail 1

1962	News briefs. 1962-03 1.1 MB

Seattle, WA 6

1963	GN Radio Works in Tunnel 1.1 MB
1962	News briefs. 1962-03 1.1 MB
1964	News briefs. 1964-04 1.3 MB
1964	News briefs. 1964-10 768.6 KB
1965	News briefs. 1965-09 381.8 KB
1920	The New Electrification on the St. Paul 485.4 KB

Secaucus, NJ 1

1931	The Signaling of the Lackawanna Electrified Territory 5.9 MB

Sedalia, MO 1

1964	News briefs. 1964-06 812.0 KB

Sedley, IN 1

1934	CTC Replaces Staff on GTW 2.6 MB

Seifert, IN 1

1948	CTC Keeps ‘em Rollin’ on C&EI 2.1 MB

Selbytown, IL 1

1911	Signaling on the Illinois Traction System 1.5 MB

self-propelled cars 1

1957	Lehigh Valley has check-in, check-out 755.3 KB

self-propelled railcars 1

1958	RS&C 50th anniversary: Looking ahead 652.9 KB

Seligman, AZ 5

1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-05 1.0 MB
1961	News briefs. 1961-06 725.8 KB
1961	Santa Fe Signals New Main Line 913.2 KB
1960	Signaling enters automation 630.7 KB

Selinsgrove, PA 1

1924	Results of Train Control Test on Pennsylvania 3.1 MB

Selkirk, NY 3

1927	Color Light Automatic Block Signals Installed on the New York Central 3.6 MB
1962	News briefs. 1962-08 675.9 KB
1965	News briefs. 1965-02 1.9 MB

Selma, NC 1

1961	News briefs. 1961-04 1.5 MB

semaphore controller 1

1940	Controller Adjuster 1.3 MB

semaphore mechanisms 1

1911	Summary of Recent Progress in Signaling 4.4 MB

semaphore signal 1

1922	Moving Day 255.2 KB

semaphore signaling 2

1922	Introducing Economies in Signal Operation 298.9 KB
1922	New Signaling on the Big Four 717.4 KB

semaphore signals 54

1935	"Chattering" Slot Arms 2.3 MB
1939	A Message of Confidence 741.8 KB
1947	Annual Review and Outlook 404.7 KB
1936	Approach Electric Lighting On the Erie 2.7 MB
1911	Automatic Signals on the Chicago Great Western 7.4 MB
1936	Back Locks on Approach Signals 1.4 MB
1917	Block Signals on the Monon 675.3 KB
1915	British and American Railroad Signaling 3.6 MB
1939	Burlington Replaces Semaphores With Color Lights 3.4 MB
1937	Color Light Signals Replace Semaphores on Union Pacific 4.2 MB
1958	DL&W-Erie joint operation is ready to go 643.6 KB
1936	Electric Lighting of Semaphores 867.6 KB
1939	Electric Lights for Semaphores 1.9 MB
1936	Electric Lights for Semaphores and Train Approach Indicators on the Rock Island 8.9 MB
1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB
1915	Extension of New Haven signals 684.8 KB
1915	First Position Light Signal Installation 580.6 KB
1909	Gold Leaf for Signal Blades 351.9 KB
1959	Kinks. 1959-11 258.3 KB
1940	New Searchlight Signal 2.7 MB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-07 494.2 KB
1963	News briefs. 1963-10 497.4 KB
1964	News briefs. 1964-07 833.0 KB
1965	News briefs. 1965-08 749.4 KB
1922	News of the Month. 1922-01 315.5 KB
1922	News of the Month. 1922-04 613.8 KB
1922	News of the Month. 1922-05 426.4 KB
1922	News of the Month. 1922-06 516.2 KB
1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-09 562.2 KB
1922	News of the Month. 1922-10 368.4 KB
1935	Night Check of Signal Lights 1.2 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1955	Pennsylvania installs wayside equipment for cab signaling 745.7 KB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1921	Progress of Railroad Signaling in America 731.8 KB
1943	Railway Signaling in North Africa 3.5 MB
1915	Red as a Danger Indication 283.5 KB
1935	Repeating Reverse Signal Indication 2.9 MB
1959	Santa Fe CTCs double track line 2.2 MB
1913	Settled at Last 824.8 KB
1922	Signal Construction on the Santa Fe 797.6 KB
1947	Signaling and Interlocking in Italy 684.8 KB
1911	Signaling on the Illinois Traction System 1.5 MB
1935	Snubbing Rectifier for 2A Signal 1.9 MB
1935	Snubbing Relay for Semaphores 1.0 MB
1909	Solenoid Signals 2.1 MB
1912	The Automatic Signal and the Local Circuit 1.9 MB
1936	The Delaware, Lackawanna & Western's Approach-Lighting System for Semaphore Signals 3.4 MB
1924	Three-Indication Distant Signals on Alsace-Lorraine Railways 2.7 MB
1916	TRAIN signs on the Santa Fe 258.1 KB
1915	Victoria Jubilee Bridge Protection 570.0 KB
1959	What’s the answer? Atomic lamps. 1959-12 194.6 KB

semi-automatic interlocking 4

1959	Santa Fe CTCs double track line 2.2 MB
1935	Semi-Automatic Interlocking at a Crossing on the Alton 4.4 MB
1937	Semi-Automatic Interlockings on the Boston Elevated 3.8 MB
1951	Street and Railroad Crossing Protection Combined 529.9 KB

semi-automatic signaling 2

1919	Block Signaling Practice on a British Railway (Part 3) 337.3 KB
1957	What's the answer: Slotting relay? 361.2 KB

seniority districts 1

1965	Signalmen's President Jesse Clark discusses safety on the railroads 648.8 KB

sequence switch interlocking 1

1953	Route Lever Interlocking on Rock Island 6.5 MB

Servo 9

1958	Carrier sends hot box indications to dispatchers' office 810.6 KB
1960	From the field 945.2 KB
1959	Hot box detector sets signals 1.2 MB
1962	Hotbox Detectors Talk 2.0 MB
1959	L&N installs hot box detector 480.3 KB
1960	Long-distance hot box detection 861.0 KB
1963	News briefs. 1963-07 489.2 KB
1959	Now: Instant hotbox location 829.3 KB
1960	What's the answer? Snow shields 424.6 KB

Seventeenth Street, Chicago, IL 1

1944	Automatic Signaling, Train Stop, and Route Interlocking Installed in the Chicago Subways 8.6 MB

Shadle automatic train control 1

1922	Automatic Train Control in Use On American Railroads 353.7 KB

Shadle train control 1

1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB

Shaker Heights Transit 1

1955	New Cleveland Transit System 917.8 KB

Shamokin, PA 1

1936	Reading Installs Unique Crossing Protection 9.5 MB

Shands, SC 1

1960	News briefs. 1960-06 1.2 MB

Sharon Yard, Cincinnati, OH 1

1964	News briefs. 1964-08 811.5 KB

Sharon, OH 1

1942	Centralized Traffic Control on the Erie 464.3 KB

Sharon, WI 1

1913	New Block Signaling on the North-Western 1.8 MB

Sharonville, OH 1

1965	News briefs. 1965-01 2.0 MB

Sharpes, FL 1

1964	News briefs. 1964-08 811.5 KB

Sheets, R. A. 1

1937	Personal: C&NW 1.3 MB

Shelby, MT 1

1963	News briefs. 1963-06 961.3 KB

Sheldon, IL 1

1962	News briefs. 1962-10 461.7 KB

shelf relay 1

1910	The Hall Signal Company’s New Relay 1.4 MB

Shenandoah, VA 1

1926	Train Control Progress in 1925 3.1 MB

Sheridan, WI 1

1963	News briefs. 1963-10 497.4 KB

Sherman Hill, WY 1

1955	CTC and cab signaling on Union Pacific 789.5 KB

Sherman, FL 1

1963	News briefs. 1963-11 1.4 MB

Sherman, WY 1

1955	CTC and cab signaling on Union Pacific 789.5 KB

Sherwood, OH 1

1965	News briefs. 1965-06 1.2 MB

Shippensburg, PA 1

1950	CTC on the Reading 6.6 MB

shipping case 1

1911	Relay Shipping Case 1.1 MB

Shirley, CA 1

1922	Signal Construction on the Santa Fe 797.6 KB

Shirley, IN 1

1962	News briefs. 1962-02 1.4 MB

Shopton, IA 5

1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-05 1.0 MB
1962	News briefs. 1962-02 1.4 MB
1963	News briefs. 1963-01 951.3 KB
1926	Train Control Progress in 1925 3.1 MB

Shore Line Jct., CT 1

1956	New Haven Consolidates Control of Nine Interlocking Layouts 8.3 MB

Shoreham Yard, Minneapolis, MN 1

1962	News briefs. 1962-02 1.4 MB

show sheds 1

1935	Electric Interlocking in Snow Sheds on the Southern Pacific 8.2 MB

Shreveport, LA 3

1965	News briefs. 1965-12 609.3 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1957	Signal controls by track circuit only 575.8 KB

shunting sensitivity 3

1957	Lehigh Valley has check-in, check-out 755.3 KB
1958	Santa Fe tests AF track circuits 1.6 MB
1957	Track circuit developments in Europe 234.8 KB

Sibley River Branch, MO 1

1960	News briefs. 1960-03 1.9 MB

Sibley, MO 1

1960	News briefs. 1960-05 1.0 MB

siding-to-siding blocks 1

1958	One track does work of two on Maine Central 442.6 KB

sidings 2

1956	Main Track Leaving Signal 2.2 MB
1961	Should Sidings Have Circuits? 347.6 KB

Sidney, IL 1

1941	Automatics Installed on the Wabash 4.0 MB

Siemens & General Electric (Signals) 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

Siemens manual block 1

1957	Letter to the editor: signal checking circuit used in the Netherlands 225.9 KB

Sierra Blanca, TX 1

1962	Centralization – Dispatch Circuits Are Changing 1.3 MB

Sierra Nevada mountains 1

1935	Electric Interlocking in Snow Sheds on the Southern Pacific 8.2 MB

Signal Accessories Corporation 1

1928	Saco Lever Circuit Controller 735.1 KB

signal applications 1

1954	Fewer ICC Signal Applications 1.7 MB

signal aspects 25

1949	A Century of Signal Glass Developments 4.2 MB
1943	A Review of 1942 2.9 MB
1939	Cab Signaling and Train Control On the San Francisco-Oakland Bay Bridge 7.2 MB
1936	Double-Caution Signaling 3.4 MB
1935	Flashing Aspects 1.3 MB
1950	High Speed Turnout Signaling 2.3 MB
1943	Instructions in Signal Aspects and Indications to New Employees 5.6 MB
1939	Intermediate Signals and Approach Aspects 2.3 MB
1950	Lunar White 419.3 KB
1935	Modern Signal Aspects on the Boston & Maine 5.1 MB
1935	Multiple Aspect Signaling 3.3 MB
1935	Multiple-Block Signaling 7.0 MB
1939	Problems of Four-Indication Signaling 1.6 MB
1943	Progress in the Use of Coded Track Circuits 1.6 MB
1935	Purple Signal Glasses 3.6 MB
1935	Purple Signal Glasses 3.3 MB
1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB
1963	Signal changes make transit run on railroad 1.1 MB
1950	Signaling and Rules 1.4 MB
1939	Special Aspects for Detectors 937.0 KB
1939	The Problem of Medium Speed 835.3 KB
1939	Track Turnouts and Signal Aspects 1.8 MB
1949	Train Operation By Signal Inidication Used Extensively on the Nickel Plate 6.1 MB
1935	Use of Marker Lamps 1.0 MB
1949	Varied Light Intensity 921.0 KB

signal blocking 1

1959	Pushbutton console for CTC 785.3 KB

signal blueprints 1

1936	Maintainers' Blueprint Plans 4.2 MB

signal cable 2

1959	How to splice plastic cable 1.2 MB
1961	Single Cable System Proposed for Signal and Communications Circuits 808.3 KB

signal colors 6

1949	A Century of Signal Glass Developments 4.2 MB
1935	Multiple Aspect Signaling 3.3 MB
1935	Purple Signal Glasses 3.6 MB
1935	Purple Signal Glasses 3.3 MB
1915	Red as a Danger Indication 283.5 KB
1937	Selection of Colors for Signal Lights 1.3 MB

signal construction 4

1951	More Signal Construction in 1950 1.0 MB
1937	Prepare for Construction 1.2 MB
1937	Signaling Construction Methods 2.6 MB
1959	Signaling moderate during '58 528.6 KB

signal construction outlook 1

1962	1962 outlook 3.0 MB

signal education 1

1957	Survey shows progress in signal education 330.6 KB

Signal Engineer 1

1958	Six editors in 50 years 253.5 KB

signal failure reporting 1

1908	Reporting System of the Illinois Central Railroad 1.3 MB

signal failures 4

1950	Continued Improvement In Signal Performance 1.3 MB
1946	Improved Signal Performance 446.8 KB
1908	Reporting System of the Illinois Central Railroad 1.3 MB
1965	Signal failures reported by ICC 1.1 MB

signal flags 1

1937	Flag and Torpedo Containers 903.1 KB

signal glass 4

1949	A Century of Signal Glass Developments 4.2 MB
1929	Factors to be Considered in Selecting Glass for Signal Lenses 4.2 MB
1915	Glass Standardization for Railway Signaling 1.0 MB
1915	Red as a Danger Indication 283.5 KB

signal indications 10

1939	Action at Approach Signal 964.5 KB
1935	Collision on the T&P 2.0 MB
1936	Demands for Modern Signaling 12.1 MB
1936	Double-Caution Signaling 3.4 MB
1943	Instructions in Signal Aspects and Indications to New Employees 5.6 MB
1911	Letters to the Editor: Uniform Signaling: A reply to Mr. Rudd 1.8 MB
1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB
1950	Signaling and Rules 1.4 MB
1911	Signaling Practice on Steam Railways 5.5 MB
1940	Single-Track Signaling 2.5 MB

Signal Inspection Act 1

1958	Signal Inspection Act 214.8 KB

signal inspection law 1

1937	Signal Inspection Bill Passed by Congress 3.4 MB

signal inspections 2

1911	Results of Inspections Made by the Block Signal and Train Control Board 2.8 MB
1939	The Signaling Regulations 907.9 KB

signal instruction 1

1937	Instructing Enginemen on Signal Indications 2.7 MB

signal lamps 7

1935	Checking Signal Lamps 3.3 MB
1935	Night Intensity of Signal Lamps 2.6 MB
1937	Replacement and Life of Lamps 3.0 MB
1956	Signal Lamp Test 1.4 MB
1956	Signal Lamp Test 950.0 KB
1947	Smaller Signal Lamps 295.9 KB
1922	The Electric Lamp for Railway Signals 761.5 KB

signal lenses 1

1949	A Century of Signal Glass Developments 4.2 MB

signal lighting 5

1937	Electric Signal Lights in Austria 1.2 MB
1935	Night Check of Signal Lights 1.2 MB
1935	Night Intensity of Signal Lamps 2.1 MB
1958	RS&C 50th anniversary: Looking ahead 652.9 KB
1965	What's the Answer? 1965-06 235.3 KB

signal maintainers 2

1937	Broken Rails 1.1 MB
1935	Maintainers' Tool Houses 2.2 MB

signal maintenance 3

1960	Gangs do signal maintenance 309.7 KB
1922	Labor Board Decides that IBEW Has No Jurisdiction of Signal Men 374.5 KB
1960	Signaling enters automation 630.7 KB

signal mechanisms 1

1935	Obsolescence in Signaling 3.4 MB

signal nomenclature 1

1921	The Use of a Standard System of Nomenclature 337.6 KB

signal performance 1

1950	Continued Improvement In Signal Performance 1.3 MB

signal projects 1

1956	Photography 1.5 MB

signal repair 1

1939	A Signal Shopping Policy 965.3 KB

signal repair shop 1

1931	Burlington Develops Signal Repair Shop at Aurora, IL 370.9 KB

Signal Section 1

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB

signal shop 2

1939	A Signal Shopping Policy 965.3 KB
1956	Three Signal Shops into One 7.0 MB

signal slot 1

1957	What's the answer: Slotting relay? 361.2 KB

signal spacing 8

1935	A Problem in Spacing Signals for Higher Train Speeds 1.6 MB
1935	Braking Distance with Signals 2.4 MB
1935	Multiple Aspect Signaling 3.3 MB
1935	New Signaling on the Route of the C&NW "400" 9.6 MB
1935	Respacing Automatics on the Pennsylvania 1.8 MB
1935	Safety of High Speed Trains 5.2 MB
1935	Signaling for Higher Train Speeds 3.0 MB
1935	Stopping Distance and Signal Spacing 1.8 MB

signal standards 4

1910	Drafting Room Practice in the Signal Department 1.3 MB
1913	Settled at Last 824.8 KB
1910	Supplemental Notes on Drafting Practice 382.8 KB
1935	The Rudd-Rhea Signaling Report of the Pennsylvania 9.7 MB

signal testing 4

1940	Pennsylvania Testing Procedure 16.6 MB
1940	Pennsylvania Testing Procedure (Part II) 8.6 MB
1940	Pennsylvania Testing Procedure (Part III) 8.9 MB
1965	What's the Answer? 1965-07 629.7 KB

signal training 2

1943	Instructions in Signal Aspects and Indications to New Employees 5.6 MB
1965	Signalmen's President Jesse Clark discusses safety on the railroads 648.8 KB

signal transformers 1

1935	Signal Transformers 2.2 MB

signal trouble 4

1911	An Interesting Case of Trouble 776.2 KB
1937	Unusual Signal Trouble 1.2 MB
1939	Unusual Signal Trouble 835.4 KB
1937	Unusual Signaling Trouble 2.2 MB

signaling 14

1937	Gauntlet Signals on the B&LE 7.1 MB
1933	Modern Signaling in Soviet Russia 3.3 MB
1943	Railway Signaling in North Africa 3.5 MB
1935	Remote Control on the Seaboard 5.4 MB
1935	Signaling at Spring Switches 2.6 MB
1938	Signaling at Spring Switches 930.3 KB
1952	Soo Line Completes Signaling on 260 Miles of Single Track 737.7 KB
1950	Spring Switch Signaling 2.5 MB
1912	The New York, Westchester & Boston Railway (1912-08) 4.1 MB
1912	The New York, Westchester & Boston Railway (1912-10) 4.7 MB
1912	The New York, Westchester & Boston Railway (1912-12) 4.8 MB
1945	The Post-War Importance of Signaling 522.0 KB
1927	The Public Is Interested in Signaling 444.4 KB
1928	Why Markers for Automatic Signals? 494.6 KB

signaling practice 4

1911	A Summary of Signaling Practice 3.6 MB
1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB
1937	Report of Committee X – Signaling Practice 2.9 MB
1911	Signaling Practice on Steam Railways 5.5 MB

signals 3

1915	British and American Railroad Signaling 3.6 MB
1920	The Use of Signals for Better Train Operation (Part 1 of 2) 5.7 MB
1920	The Use of Signals for Better Train Operation (Part 2 of 2) 7.3 MB

signs 1

1956	CTC Signs 1.8 MB

Siloam Springs, AR 1

1960	News briefs. 1960-03 1.9 MB

Silvis, IL 4

1944	Coded Track Circuits for CTC and Cab Signaling 4.0 MB
1944	Rock Island Installs Cab Signaling and Centralized Traffic Control 10.0 MB
1949	Signaling Adapted to Traffic On the Rock Island 5.2 MB
1958	Signaling to cut expenses in '58 411.4 KB

Simmons, H. H. 1

1958	Six editors in 50 years 253.5 KB

simulation 1

1962	Computer Simulation of CTC 220.3 KB

Sinclair, MT 1

1937	Automatic Plant Replaces Mechanical Interlocking 1.3 MB

Singer, VA 1

1961	News briefs. 1961-04 1.5 MB

single-track line 1

1936	What Is the Capacity of a Single-Track Line? 2.0 MB

single-tracking 1

1956	Double to Single Track With CTC 7.4 MB

Sinks, KY 2

1947	Annual Review and Outlook 404.7 KB
1946	CTC on 107 Miles of Single Track on the Louisville & Nashville 5.2 MB

Sioux City, IA 1

1964	Milwaukee installs its first microwave 277.4 KB

Sioux Falls, SD 1

1964	Milwaukee installs its first microwave 277.4 KB

Sir Johns Run, WV 1

1944	Remote Control Project Saves Train Time on the Baltimore & Ohio 3.5 MB

Skamania, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Skokie Jct., IL 1

1926	North Shore Line Installs Two Electric Interlockers 2.1 MB

Skyline, MT 1

1942	Application Denied 194.9 KB

Slaton, TX 2

1960	News briefs. 1960-10 1.8 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Sleeper, MO 1

1947	Frisco Moves CTC to One Office 481.1 KB

slide detector fences 5

1947	107 Miles of CTC on the N&W 2.3 MB
1962	Automatic Dispatching 2.1 MB
1961	News briefs. 1961-04 1.5 MB
1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB
1936	Slide Detector Fences 4.3 MB

Sloan, IL 1

1922	News of the Month. 1922-06 516.2 KB

Sloatsburg, NY 1

1959	ICC reports on Erie wreck 440.4 KB

slot arms 1

1935	"Chattering" Slot Arms 2.3 MB

slow orders 1

1950	Temporary Change of Signal Controls 2.2 MB

SLV-13 AC relays 1

1940	Plug Couplers for Relays and Signals 1.3 MB

Smallwood, Labrador 1

1962	1962 outlook 3.0 MB

smashboards 1

1931	Chicago, St. Paul, Minneapolis & Omaha Eliminates Nearly 20,000 Train Stops Annually 767.7 KB

Smith Falls, Ontario 1

1922	News of the Month. 1922-08 394.0 KB

Smithtown, NY 1

1960	News briefs. 1960-04 896.6 KB

snow 3

1958	What's the answer? Snow on signals 711.5 KB
1960	What's the answer? Snow shields 494.7 KB
1960	What’s the answer? Snow shields 224.6 KB

snow detectors 4

1959	Fewer wayside observers makes automatic hazard detection necessary 1.1 MB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB
1958	Signaling to cut expenses in '58 411.4 KB
1961	Snow Detectors 231.2 KB

snow melters 5

1957	Bessemer takes up second track and installs Centralized Traffic Control 706.4 KB
1957	GN CTC's 175 miles of mainline 635.9 KB
1958	Interlocking saves time and money for the Belt Railway of Chicago 2.0 MB
1957	More automation for signaling in 1957 1.2 MB
1956	Snow Melters 2.6 MB

snow shields 3

1958	What's the answer? Snow on signals 711.5 KB
1960	What's the answer? Snow shields 494.7 KB
1960	What’s the answer? Snow shields 224.6 KB

snubbing rectifier 1

1935	Snubbing Rectifier for 2A Signal 1.9 MB

snubbing relay 1

1935	Snubbing Relay for Semaphores 1.0 MB

Soapstone, MA 1

1947	Hoosac Tunnel Interlocking and CTC 1.7 MB

Social Circle, GA 1

1947	Automatic Block With Spring Switches installed on the Georgia Railroad 851.4 KB

solar angle 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

Soldier Summit, UT 1

1961	News briefs. 1961-10 1.0 MB

solid state coded control 1

1963	Interlocking: New Solid State Devices Save Money 2.1 MB

solid state coded track circuits 1

1963	Special Report: P&LE Signaling and Communications 3.9 MB

solid state interlocking control 1

1963	Special Report: P&LE Signaling and Communications 3.9 MB

solid state signaling 1

1963	Solid State Devices 938.4 KB

Somerset, KY 1

1924	Three Train Control Contracts Let 1.9 MB

Somerset, MA 1

1916	William Robinson, Inventor of the Track Circuit 373.1 KB

Somerville, MA 1

1951	Glass Library and Museum 319.8 KB

Somerville, TX 1

1922	Signal Construction on the Santa Fe 797.6 KB

Soo Line 20

1960	Fourteen RRs adopt new operating code 945.4 KB
1949	192 Miles of Automatic Block On Soo Line 6.0 MB
1948	Gates at Three Crossings on Soo Line 1.8 MB
1965	Midwest RRs fight the weather 914.4 KB
1961	News briefs. 1961-10 1.0 MB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-07 494.2 KB
1963	News briefs. 1963-03 790.6 KB
1963	News briefs. 1963-10 497.4 KB
1964	News briefs. 1964-02 992.4 KB
1964	News briefs. 1964-05 1.0 MB
1964	News briefs. 1964-08 811.5 KB
1965	News briefs. 1965-05 1.4 MB
1965	News briefs. 1965-09 381.8 KB
1965	News briefs. 1965-10 1.1 MB
1941	Remote Control Installation 2.4 MB
1933	Remote Control on Soo Line 2.7 MB
1952	Soo Line Completes Signaling on 260 Miles of Single Track 737.7 KB
1965	What's the answer? 1965-12 261.7 KB
1960	What’s the answer? Automatic OS 354.1 KB

Sorento, IL 1

1962	News briefs. 1962-02 1.4 MB

Sorrento, CA 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Souhern 1

1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB

Soundscriber 1

1948	Car Numbers “Grabbed” by Voice Recorder 783.1 KB

soup 1

1939	Unusual Signal Trouble 835.4 KB

South Acton, MA 1

1935	New Signaling on the Boston & Maine 9.9 MB

South African Railways 1

1963	News briefs. 1963-04 896.6 KB

South Amboy, NJ 2

1937	New Signaling on Pennsylvania 1.0 MB
1938	Pennsylvania Electrification Signaling 5.3 MB

South Austraila Government Railways 1

1922	Single Track Signaling in Australia 527.7 KB

South Australia 1

1915	Electric Interlockings in Australia 3.9 MB

South Bend, IN 4

1927	Chicago South Shore & South Bend Changes Signal Equipment 2.6 MB
1930	New Electric Interlocking 3.2 MB
1949	New Space Radio Relay System Adopted by South Shore 4.2 MB
1935	New York Central Extends South Bend Interlocking 6.0 MB

South Bend, NE 1

1955	CTC on single and double track 406.8 KB

South Branch Bridge 1

1931	One Electric Interlocking for Two Drawbridges 3.1 MB

South Cheney, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

South Chicago, IL 3

1947	Drawbridge Interlocking on the Elgin, Joliet & Eastern 647.3 KB
1962	EJ&E Uses Tone Coding to Get Systems on One RF Channel 562.3 KB
1956	Length of Train Selects Control of Crossing Gates on Illinois Central 4.6 MB

South Dayton, OH 1

1960	News briefs. 1960-09 756.9 KB

South Denver, CO 2

1950	Automatic Block Increases Safety on Paired Trackage 4.6 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

South Dillon, SC 1

1962	News briefs. 1962-05 826.8 KB

South Florence, SC 1

1963	News briefs. 1963-01 951.3 KB

South Gate, CA 1

1930	New Type Rail Crossing Uses Turntable Principle 964.5 KB

South Janesville, WI 1

1913	New Block Signaling on the North-Western 1.8 MB

South Jct., Montreal, Quebec 1

1961	News briefs. 1961-03 1.0 MB

South Jersey High Speed Transit Line 1

1965	News briefs. 1965-01 2.0 MB

South Joliet, IL 2

1929	C. & A. Modernizes Signaling Facilities 2.2 MB
1934	Centralized Traffic Control Installed on the Alton 1.7 MB

South La Grange, ME 1

1957	BAR takes up second track and installs CTC 706.6 KB

South Litchfield, IL 1

1962	News briefs. 1962-10 461.7 KB

South Louisville, KY 1

1947	CTC Down by the Ohio 2.7 MB

South Mt. Vernon, NY 1

1924	Signal Development in Connection With Single Phase Propulsion 5.1 MB

South Pekin, IL 1

1963	News briefs. 1963-11 1.4 MB

South Pembroke, NC 2

1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-05 826.8 KB

South Scranton, PA 1

1960	News briefs. 1960-03 1.9 MB

South Side Elevated 1

1922	News of the Month. 1922-09 562.2 KB

South St. Paul, MN 1

1965	Midwest RRs fight the weather 914.4 KB

South Street, PA 1

1935	Automatic Interlocking on the Philadelphia Elevated 6.1 MB

South Tower, GA 1

1955	News briefs. 1955-08 830.4 KB

South Upton, IL 1

1926	North Shore Line Installs Two Electric Interlockers 2.1 MB

South Walthourville, GA 1

1955	News briefs. 1955-08 830.4 KB

South Whitley, IN 2

1928	Early APB Signaling 408.5 KB
1943	New York, Chicago & St. Louis Installs Centralized Traffic Control on Busy Sections of Single Track 7.9 MB

Southern 82

1927	Additional Solutions to Call-On Signal Circuit Problem 2.8 MB
1936	Alining Signals on Curves 3.7 MB
1949	Applications to ICC 1949-11 926.1 KB
1930	Approach-Lighting a Leaving Signal 1.0 MB
1933	Are Switch Lamps Needed? 506.3 KB
1922	Automatic Train Control in Use On American Railroads 353.7 KB
1950	Big NX Interlocking at Atlanta 6.3 MB
1933	Call-On Signals 930.2 KB
1933	Call-On Signals (editorial) 1.0 MB
1956	Centralia Has Protection of All Crossings 6.7 MB
1947	Choice of Interlocking Control Machines 266.5 KB
1947	Construction of Towers 213.3 KB
1953	Control of Four Layouts Consolidated in One Interlocking 5.3 MB
1935	Crossing Bells at Flasher Signals 1.9 MB
1932	Crossing Problem 2.6 MB
1935	Crossing Signals on the Southern 1.4 MB
1931	Derails in Passing Sidings 1.1 MB
1950	Double to Single Track with Remote Control 4.2 MB
1951	Double Track to Single With CTC 197.9 KB
1919	Electric Interlocking at Charlottesville, VA 535.5 KB
1935	Facing Point Locks on Switches 3.2 MB
1937	Height of Light Signals 1.0 MB
1958	How to save time when trains are entering yards 513.6 KB
1946	ICC 50-MPH Signal Hearing 6.9 MB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1935	Installation of Bond Wires 4.0 MB
1937	Instructing Enginemen on Signal Indications 2.7 MB
1940	Intermediate Signal Spacing and Control 2.1 MB
1930	Light-out Protection 1.1 MB
1935	Maintainers' Tool Houses 2.2 MB
1926	Marker Lights on Single Track 415.3 KB
1950	Modern Communications In Yards and Terminals 1.4 MB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1957	More automation for signaling in 1957 1.2 MB
1951	More Signal Construction in 1950 1.0 MB
1955	Much is new in signaling for 1955 826.7 KB
1921	New Interlockings at Jacksonville Terminal 3.4 MB
1954	New Orleans Passenger Terminal 4.7 MB
1960	News briefs. 1960-01 1.1 MB
1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-10 1.8 MB
1960	News briefs. 1960-11 875.5 KB
1961	News briefs. 1961-04 1.5 MB
1961	News briefs. 1961-11 1.3 MB
1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-05 826.8 KB
1962	News briefs. 1962-10 461.7 KB
1963	News briefs. 1963-02 1.3 MB
1963	News briefs. 1963-03 790.6 KB
1963	News briefs. 1963-05 720.2 KB
1964	News briefs. 1964-05 1.0 MB
1964	News briefs. 1964-06 812.0 KB
1964	News briefs. 1964-09 879.4 KB
1964	News briefs. 1964-10 768.6 KB
1965	News briefs. 1965-02 1.9 MB
1965	News briefs. 1965-06 1.2 MB
1965	News briefs. 1965-07 788.3 KB
1965	News briefs. 1965-08 749.4 KB
1965	News briefs. 1965-09 381.8 KB
1965	News briefs. 1965-10 1.1 MB
1966	News briefs. 1966-01 1.4 MB
1922	News of the Month. 1922-01 315.5 KB
1941	Non-Stop Permissive Signals 1.4 MB
1937	Ohio Flood Damages Signaling 9.7 MB
1927	Organization of Railroad Signal Departments 3.9 MB
1921	Proposed Modification of Stop-and-Proceed Rule 1.4 MB
1940	Remote Control On the Southern 3.8 MB
1960	Short track circuit causes accident 436.0 KB
1928	Signal and Train Control Hearing Ends 2.0 MB
1928	Signal Aspects for "Head-In" Indication at Passing Track 1.0 MB
1959	Signaling moderate during '58 528.6 KB
1928	Signals Should Keep Trains Moving 400.7 KB
1936	Slide Detector Fences 4.3 MB
1958	Special combinations of single-track and two-track replace double track on the Southern 960.9 KB
1937	Switch Protection in Automatic Territory 3.0 MB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1924	Three Train Control Contracts Let 1.9 MB
1935	Traffic Type Signals for Protection of Highway-Railroad Crossings 2.5 MB
1926	Train Control Progress in 1925 3.1 MB
1954	Unique Combinations of Single-Track and Two-Track Developed on the Southern 3.8 MB
1920	Watch the Second Hand 731.6 KB
1928	Why Markers for Automatic Signals? 494.6 KB

Southern (UK) 1

1926	Four-Aspect Color-Light Signals Installed on English Road 2.8 MB

Southern Pacific 133

1943	A Review of 1942 2.9 MB
1934	An Electric Interlocking on the Southern Pacific 1.8 MB
1936	Annunciator Circuits 2.6 MB
1962	Automatic Dispatching 2.1 MB
1935	Automatic Interlocking Involves Highway Crossing Signals 3.4 MB
1928	Automatic Signals Within Yard Limits 1.0 MB
1922	Automatic Train Control in Use On American Railroads 353.7 KB
1923	Cabin Interlockings for Crossings 1.5 MB
1962	Centralization – Dispatch Circuits Are Changing 1.3 MB
1932	Centralized Traffic Control 3.1 MB
1943	Centralized Traffic Control Speeds War Traffic on 80.5-Mile Section of the Southern Pacific 10.3 MB
1935	Checking Rail Ends on Drawbridges 2.5 MB
1935	Checking Signal Lamps 3.3 MB
1965	Collision due to signal failure 648.5 KB
1956	Conelrad – A Civil Defense Measure … How Some Railroads are Participating 4.1 MB
1954	CTC Improves Train Operation 3.3 MB
1950	CTC on Sunset Route 3.1 MB
1957	CTC on the SP has special devices 518.8 KB
1942	CTC Saves Train Time on a Section of the Southern Pacific 829.6 KB
1935	Depression Operation of Interlocking 2.6 MB
1933	Economics of Modern Signaling 2.1 MB
1935	Electric Interlocking in Snow Sheds on the Southern Pacific 8.2 MB
1915	Electro-Pneumatic Plant at San Francisco 2.4 MB
1935	Facing Point Locks on Switches 3.2 MB
1935	Flashing Aspects 1.3 MB
1957	How long sidings save train time 465.2 KB
1947	How Low Is a Dwarf? 438.7 KB
1946	ICC 50-MPH Signal Hearing 6.9 MB
1947	ICC Holds Signal Hearing 507.5 KB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1937	Instructing Enginemen on Signal Indications 2.7 MB
1937	Interlocking and Signaling For New Bridge at New Orleans 5.9 MB
1935	Interlocking on Southern Pacific Suisun Bay Bridge 4.6 MB
1950	Interlocking Plant Horns 2.3 MB
1956	Interlocking Relays 3.9 MB
1922	Introducing Economies in Signal Operation 298.9 KB
1936	Lost Motion in Locking 3.0 MB
1935	Maintainers' Tool Houses 1.1 MB
1927	Marking Signals When Out of Service 1.1 MB
1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1955	Modern communications essential to efficient railroading 696.7 KB
1957	More automation for signaling in 1957 1.2 MB
1946	More Difficult to Get a Call-On Signal 488.8 KB
1936	Motor Car Indicators 2.9 MB
1955	Much is new in signaling for 1955 826.7 KB
1935	Multiple Aspect Signaling 3.3 MB
1936	New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans 7.9 MB
1939	New Interlocking at Los Angeles 9.6 MB
1954	New Orleans Passenger Terminal 4.7 MB
1913	New Signaling Across the Great Salt Lake 2.2 MB
1930	New Type Rail Crossing Uses Turntable Principle 964.5 KB
1959	News briefs. 1959-05 506.5 KB
1960	News briefs. 1960-04 896.6 KB
1960	News briefs. 1960-07 845.4 KB
1960	News briefs. 1960-08 603.8 KB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-09 838.3 KB
1962	News briefs. 1962-10 461.7 KB
1962	News briefs. 1962-11 468.1 KB
1963	News briefs. 1963-02 1.3 MB
1963	News briefs. 1963-03 790.6 KB
1963	News briefs. 1963-06 961.3 KB
1964	News briefs. 1964-02 992.4 KB
1964	News briefs. 1964-04 1.3 MB
1964	News briefs. 1964-07 833.0 KB
1964	News briefs. 1964-10 768.6 KB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-05 1.4 MB
1965	News briefs. 1965-07 788.3 KB
1966	News briefs. 1966-01 1.4 MB
1922	News of the Month. 1922-01 315.5 KB
1922	News of the Month. 1922-04 613.8 KB
1922	News of the Month. 1922-06 516.2 KB
1922	News of the Month. 1922-07 346.9 KB
1922	News of the Month. 1922-09 562.2 KB
1956	Photography 1.5 MB
1931	Protecting CTC Switches 2.9 MB
1959	Pushbutton console for CTC 785.3 KB
1944	Railroad Applications of Electronics 1.9 MB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB
1933	Reducing Unnecessary Train Stops 2.5 MB
1956	Release of Locking 3.7 MB
1962	Remote Control Interlocking Has Time Division Multiplex System 846.3 KB
1935	Removal of Switch Indicators 2.3 MB
1939	Repairing Spring Switch Mechanisms 1.8 MB
1935	Repeating Reverse Signal Indication 2.9 MB
1965	RLEA objects to 11 RS&I changes 1.1 MB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB
1927	Should Motor Car Operators Watch Signals More Carefully 1.2 MB
1928	Signal and Train Control Hearing Ends 2.0 MB
1960	Signal construction steady in 1959 385.2 KB
1960	Signaling enters automation 630.7 KB
1925	Signaling of Paired Track Operation 1.3 MB
1958	Signaling to cut expenses in '58 411.4 KB
1956	Small Flat Top Console for Controls And Separate Diagram for Indications 5.3 MB
1956	Snow Melters 2.6 MB
1947	Southern Pacific Installs CTC 990.2 KB
1945	Southern Pacific Installs CTC on 72 Miles of Single Track 5.6 MB
1941	Southern Pacific Installs Interlocking at Drawbridge 6.3 MB
1940	Southern Pacific Petition Denied 3.0 MB
1940	Southern Pacific Washes Insulators 1.5 MB
1962	SP Has 500 Miles of Automatic CTC 363.6 KB
1954	SP Modernizes Automatic Block 2.0 MB
1948	Special Gate Circuits in Houston 1.4 MB
1937	Special Locking Release 2.4 MB
1931	Speed Control of Crossing Signals 586.7 KB
1936	Street Traffic Signals Controlled by Trains 5.1 MB
1957	Survey shows progress in signal education 330.6 KB
1937	Switch Protection in Automatic Territory 3.0 MB
1932	Testing OS Track Circuits 926.0 KB
1911	The Staff System on the Southern Pacific 4.0 MB
1925	The Train Control Situation 853.0 KB
1963	Theory and Operation of Grade Crossing Predictor is Explained 840.9 KB
1932	Track Capacity 2.7 MB
1926	Train Control Progress in 1925 3.1 MB
1956	Train Operations When CTC Fails 3.5 MB
1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB
1936	What Is the Capacity of a Single-Track Line? 2.0 MB
1920	What Scheme of Signaling is Most Desirable? 6.8 MB
1957	What's the answer: Slotting relay? 361.2 KB
1960	What's the answer? Absolute signals 477.6 KB
1958	What's the answer? Crossing circuits 254.4 KB
1955	What's the Answer? CTC Into Service 409.5 KB
1958	What's the answer? CTC locking 269.2 KB
1958	What's the answer? Long dead sections 571.9 KB
1960	What's the answer? Route signaling 547.7 KB
1960	What's the answer? Snow shields 494.7 KB
1916	William Robinson, Inventor of the Track Circuit 373.1 KB

Southern Pines, NC 1

1935	Remote Control on the Seaboard 5.4 MB

Southfields, NY 1

1959	ICC reports on Erie wreck 440.4 KB

Southport, LA 2

1936	New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans 7.9 MB
1954	New Orleans Passenger Terminal 4.7 MB

Soviet Union 1

1933	Modern Signaling in Soviet Russia 3.3 MB

space reservation 1

1950	New Developments 16.9 MB

Spanish Lake, MO 1

1961	News briefs. 1961-06 725.8 KB

Sparks, NV 1

1964	News briefs. 1964-04 1.3 MB

Sparta, MN 2

1944	CTC Speeds Ore Traffic On the DM&IR 4.6 MB
1962	DM&IR Consolidates CTC Control Miles 384.7 KB

Spartanburg, SC 1

1953	CTC Keeps Trains Moving on Long Grades 6.3 MB

Spaulding, IL 2

1958	CTC Handles 15 More Trains 2.2 MB
1938	EJ&E Installs APB Signaling 3.1 MB

speed checker 1

1949	Yardsticks 947.2 KB

speed control 2

1965	AFO circuits can be used in subways 676.7 KB
1952	Speed Control Installed on the Long Island 1.3 MB

speed limits 4

1946	ICC 50-MPH Signal Hearing 6.9 MB
1946	ICC Signal Hearing 1.3 MB
1946	ICC Signaling Investigation 770.4 KB
1936	Speed Limits at Automatic Interlocking 3.2 MB

speed recorders 1

1961	What’s the Answer? 1961-04 960.3 KB

speed restrictions 1

1913	Speed Restrictions on the Chicago & North Western 722.9 KB

speed selection 2

1960	CNR uses speed selection for gates 980.7 KB
1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

speed signaling 3

1947	Speed Indicators for High-Speed Turnouts 298.4 KB
1960	What's the answer? Route signaling 205.2 KB
1960	What's the answer? Route signaling 547.7 KB

speeds 1

1937	Track Layout for CTC 1.2 MB

Speer, WY 1

1955	CTC and cab signaling on Union Pacific 789.5 KB

Spencer, NC 1

1924	Three Train Control Contracts Let 1.9 MB

Spencer, WI 3

1949	192 Miles of Automatic Block On Soo Line 6.0 MB
1947	ICC Signal Hearings 179.7 KB
1952	Soo Line Completes Signaling on 260 Miles of Single Track 737.7 KB

Spencerville, IN 1

1950	CTC on the Wabash 2.6 MB

splicing signal cable 1

1959	How to splice plastic cable 1.2 MB

Spokane International 2

1960	Fourteen RRs adopt new operating code 945.4 KB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB

Spokane, Portland & Seattle 3

1960	Fourteen RRs adopt new operating code 945.4 KB
1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB
1947	Territories Involved in the ICC Signaling Order 388.2 KB

Spokane, WA 9

1961	News briefs. 1961-06 725.8 KB
1961	News briefs. 1961-12 978.0 KB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-07 494.2 KB
1962	News briefs. 1962-10 461.7 KB
1963	News briefs. 1963-03 790.6 KB
1965	News briefs. 1965-07 788.3 KB
1921	Train Order Deliverer Expedites Traffic 1.3 MB
1956	When Dispatchers Move ... Carrier Saves Wire Pair 1.3 MB

Sprague Safety Control & Signal 2

1931	GN Asks to Remove Train Control 215.6 KB
1922	The Sprague Train Control System 609.3 KB

Sprague, Frank J. 1

1922	The Sprague Train Control System 609.3 KB

spring switches 47

1937	Alton Uses Spring Switches on Ends of Double Track 5.0 MB
1947	Automatic Block With Spring Switches installed on the Georgia Railroad 851.4 KB
1946	Automatic Block With Spring Switches on the Central of Georgia 5.3 MB
1947	Automatic Signaling With Spring Switches Installed on the Great Northern 734.1 KB
1959	B&M takes up track and installs traffic control, gates and flashers 735.7 KB
1956	Burlington Has Modified CTC for Medium Traffic Single-Track 7.2 MB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB
1942	Centralized Traffic Control on the Erie 464.3 KB
1944	Coded Track Circuits for CTC and Cab Signaling 4.0 MB
1937	CTC in Coaling Station Territory 6.6 MB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1936	Demands for Modern Signaling 12.1 MB
1958	DL&W-Erie joint operation is ready to go 643.6 KB
1940	Facing Point Lock for Spring Switches 1.2 MB
1940	Facing Point Locks On Main Line Switches 2.6 MB
1935	FPL Adjustment on Spring Switches 1.3 MB
1958	How to adapt CTC to your traffic 748.3 KB
1955	How to run reverse temporarily 197.6 KB
1949	ICC Issues Statistics 850.7 KB
1958	Improved signaling results from grade elimination 883.1 KB
1944	L&N Installs CTC On an Engine District 9.0 MB
1937	Location of Signals at Spring Switches 1.3 MB
1957	More automation for signaling in 1957 1.2 MB
1950	New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB
1961	News briefs. 1961-11 1.3 MB
1951	P&WV Signals Entire Main Line 3.9 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1942	Railroad Signals Go to War 11.4 MB
1944	Remote Control Interlocking on the D&RGW 4.3 MB
1939	Repairing Spring Switch Mechanisms 1.8 MB
1944	Rock Island Installs Cab Signaling and Centralized Traffic Control 10.0 MB
1950	Rules, Standards and Instructions 1.5 MB
1937	Seaboard Utilizes Spring Switches 8.4 MB
1960	Signal construction steady in 1959 385.2 KB
1935	Signaling at Spring Switches 2.6 MB
1938	Signaling at Spring Switches 930.3 KB
1945	Signaling for Spring Switches 579.1 KB
1959	Signaling moderate during '58 528.6 KB
1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB
1952	Soo Line Completes Signaling on 260 Miles of Single Track 737.7 KB
1954	SP Modernizes Automatic Block 2.0 MB
1937	Spring Switch at Branch Line Terminus 5.0 MB
1950	Spring Switch Signaling 2.5 MB
1929	The Year 1928 in Retrospect and the Outlook for 1929 1.5 MB
1957	What's the Answer: Spring switches? 200.0 KB

Spring Valley, IL 3

1944	Coded Track Circuits for CTC and Cab Signaling 4.0 MB
1944	Rock Island Installs Cab Signaling and Centralized Traffic Control 10.0 MB
1949	Signaling Adapted to Traffic On the Rock Island 5.2 MB

Spring, TX 1

1963	News briefs. 1963-08 1.2 MB

Springfield, IL 5

1931	Chicago & Illinois Midland Installs Electric Interlocking 2.5 MB
1950	Gulf, Mobile & Ohio Protects All Street Crossings in Springfield 2.6 MB
1945	Manual Block-Remote Control Developed On the Wabash 5.7 MB
1950	OSing Device 1.4 MB
1935	Semi-Automatic Interlocking at a Crossing on the Alton 4.4 MB

Springfield, MA 1

1915	Extension of New Haven signals 684.8 KB

Springfield, MO 6

1950	Frisco Moves CTC Machines Without Interrupting Traffic 2.9 MB
1947	Frisco Moves CTC to One Office 481.1 KB
1965	Merging divisions require changing circuits 335.5 KB
1950	Modern Communications In Yards and Terminals 1.4 MB
1951	More Signal Construction in 1950 1.0 MB
1965	News briefs. 1965-01 2.0 MB

Springfield, OH 1

1963	News briefs. 1963-11 1.4 MB

Springlake, KY 1

1965	News briefs. 1965-08 749.4 KB

Springville, UT 1

1922	News of the Month. 1922-06 516.2 KB

Spruce Creek, PA 1

1926	Directing Trains By Signals 1.9 MB

Spruce, MN 1

1944	CTC Speeds Ore Traffic On the DM&IR 4.6 MB

SS protection 1

1950	SS Protection 2.1 MB

St. Albans, VT 1

1957	Two interlockings save time and money 547.8 KB

St. Albans, WV 5

1960	News briefs. 1960-02 995.4 KB
1960	News briefs. 1960-06 1.2 MB
1961	News briefs. 1961-10 1.0 MB
1963	News briefs. 1963-03 790.6 KB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

St. Anne, IL 1

1960	News briefs. 1960-06 1.2 MB

St. Augustine, FL 1

1964	News briefs. 1964-12 981.5 KB

St. Boniface, Manitoba 1

1958	Nine layouts in one interlocking 1.7 MB

St. Charles Air Line 2

1932	Burlington Installs Extensive New Electric Interlocking 3.6 MB
1931	One Electric Interlocking for Two Drawbridges 3.1 MB

St. Charles, MO 1

1937	Signaling on the Wabash 3.7 MB

St. Cloud, MN 1

1947	Automatic Signaling With Spring Switches Installed on the Great Northern 734.1 KB

St. Francis, WI 1

1935	New Signaling on the Route of the C&NW "400" 9.6 MB

St. Henri, Quebec 1

1922	News of the Month. 1922-07 346.9 KB

St. Joe, IN 3

1950	CTC on the Wabash 2.6 MB
1962	News briefs. 1962-02 1.4 MB
1963	News briefs. 1963-04 896.6 KB

St. John, IN 1

1963	News briefs. 1963-01 951.3 KB

St. Joseph, MI 3

1949	Modern Signaling on a Division 6.6 MB
1922	News of the Month. 1922-10 368.4 KB
1946	Pere Marquette Installs CTC 3.1 MB

St. Joseph, MO 3

1960	News briefs. 1960-02 995.4 KB
1922	News of the Month. 1922-07 346.9 KB
1961	Should Sidings Have Circuits? 347.6 KB

St. Lambert, Quebec 2

1943	Canadian National Installs a Large All-Relay Electric Interlocking 8.8 MB
1915	Victoria Jubilee Bridge Protection 570.0 KB

St. Lawrence Seaway 1

1957	Seaway diverts CN mainline 532.3 KB

St. Louis Southwestern 16

1954	CTC Increases Capacity of Double Track 4.2 MB
1954	CTC into Service 2.5 MB
1946	CTC on 121 Miles of the Cotton Belt 6.4 MB
1958	News briefs. 1958-01 1.8 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1936	Reconstruction of Interlocking at the Dallas Union Terminal 14.8 MB
1928	Signal and Train Control Hearing Ends 2.0 MB
1959	Signaling moderate during '58 528.6 KB
1941	Signaling on 47 Miles of St. Louis Southwestern 12.6 MB
1944	St. Louis Southwestern Installs Centralized Traffic Control 6.9 MB
1957	Survey shows progress in signal education 330.6 KB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1944	Track Circuits on Passing Tracks in CTC Territory 941.8 KB
1956	Train Operations When CTC Fails 3.5 MB
1954	Why Cotton Belt Installed CTC On 429 Miles of Single Track 4.0 MB
1957	Why Cotton Belt installed CTC on entire main line 914.0 KB

St. Louis Southwestern of Texas 1

1947	Territories Involved in the ICC Signaling Order 388.2 KB

St. Louis Union Station 2

1947	Choice of Interlocking Control Machines 266.5 KB
1930	Interlocking at St. Louis Union Station Expanded 30 Per Cent 1.7 MB

St. Louis, Brownsville & Mexico 1

1947	Territories Involved in the ICC Signaling Order 388.2 KB

St. Louis, MO 31

1931	A Lesson from a False-Clear Failure 577.9 KB
1938	AC Primary on the Katy 442.5 KB
1941	All-Relay Signal System Installed on Terminal Railroad of St. Louis 1.2 MB
1929	Automatic Crossing Signals Used in Congested District 1.6 MB
1928	Burlington Completes Automatic Signals Chicago to Denver 5.1 MB
1947	Choice of Interlocking Control Machines 266.5 KB
1957	Consolidation cuts costs 1.1 MB
1956	Crossing Protection In Industrial Area 3.1 MB
1947	Crossover protection on the GM&O 2.6 MB
1947	CTC Down by the Ohio 2.7 MB
1939	Drag Detectors Protect Bridges 3.2 MB
1940	Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB
1930	Interlocking at St. Louis Union Station Expanded 30 Per Cent 1.7 MB
1908	Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis 7.2 MB
1941	Interlocking Restored to Service At St. Louis Union Station 3.6 MB
1931	New Interlocking for the St. Louis Municipal Bridge 2.9 MB
1955	News briefs. 1955-08 830.4 KB
1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-09 756.9 KB
1965	News briefs. 1965-01 2.0 MB
1956	NX Control Replaces Lever Machine 2.8 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1935	Safety of High Speed Trains 5.2 MB
1931	Sand Causes Signal Failure 614.1 KB
1933	Signaling of New Terminal 1.6 MB
1911	Signaling on the Illinois Traction System 1.5 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1939	St. Louis Municipal Bridge Signaling 3.8 MB
1940	St. Louis Terminal 403.1 KB
1926	Train Control Progress in 1925 3.1 MB

St. Louis-San Francisco 65

1943	Accident Involves Signaling 1.0 MB
1935	Advantages of Modern Relays 4.0 MB
1937	Approach Indications to Train Order Signals 4.2 MB
1926	Are Smash-Boards Necessary at Automatic Crossing Plants? 816.3 KB
1955	Both ways on both tracks with CTC 765.0 KB
1938	Clearing of Signals at Automatic Interlockings 2.2 MB
1956	CTC Signs 1.8 MB
1931	Efficiency Tests 1.9 MB
1932	Electric Lock on Spring Switch 399.3 KB
1927	Electric Locking Protection at Interlockers Operated Without Derails 1.1 MB
1932	False Change of Lineup 850.0 KB
1929	Frisco Installs Semaphores with Color-Light Indication 665.1 KB
1950	Frisco Moves CTC Machines Without Interrupting Traffic 2.9 MB
1947	Frisco Moves CTC to One Office 481.1 KB
1933	Frisco Uses Semaphores With Color Light Indication 1.1 MB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1956	Interlocking Phones 2.3 MB
1934	Lamp Ratings for Flashing Lights 695.8 KB
1965	Merging divisions require changing circuits 335.5 KB
1950	Modern Communications In Yards and Terminals 1.4 MB
1957	More automation for signaling in 1957 1.2 MB
1955	Much is new in signaling for 1955 826.7 KB
1956	New Three-Track Interchange Includes Interlocking and Talk-Backs 8.9 MB
1955	News briefs. 1955-08 830.4 KB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-07 494.2 KB
1965	News briefs. 1965-01 2.0 MB
1922	News of the Month. 1922-07 346.9 KB
1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-12 388.1 KB
1956	NX Control Replaces Lever Machine 2.8 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1937	Railroad Grade Crossing Gates 2.2 MB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1936	Reconstruction of Interlocking at the Dallas Union Terminal 14.8 MB
1956	Release of Locking 3.7 MB
1928	Reporting False Clear Indications 648.8 KB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1926	Semaphore or Light Signals? 1.4 MB
1928	Signal and Train Control Hearing Ends 2.0 MB
1949	Signaling Saves Time on Frisco 4.8 MB
1959	Signaling: 1960 225.2 KB
1944	St. Louis-San Francisco Installs Centralized Traffic Control 8.3 MB
1957	Survey shows progress in signal education 330.6 KB
1961	Survey Tells How Railroads Use Hotbox Detectors 1.8 MB
1956	Switch Machines for CTC 2.0 MB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1934	The Safety Feature of Signals 456.5 KB
1925	The Train Control Situation 853.0 KB
1926	Train Control Progress in 1925 3.1 MB
1962	Trains Control Automatic Bridge 1.2 MB
1937	Unusual Signaling Trouble 2.2 MB
1950	Unusual Trouble 3.0 MB
1956	Walkie-Talkies 1.5 MB
1920	What Scheme of Signaling is Most Desirable? 6.8 MB
1929	What Type of Release at Automatic Interlockers? 1.0 MB
1965	What's the Answer? 1965-07 629.7 KB
1958	What's the answer? CTC locking 269.2 KB
1958	What's the answer? Long dead sections 571.9 KB
1959	What's the answer? Repeater signals 691.6 KB
1960	What’s the answer? Automatic OS 354.1 KB
1928	Why Markers for Automatic Signals? 494.6 KB

St. Luc, Quebec 1

1950	Consolidation of Interlockings 2.5 MB

St. Paul Union Depot 1

1960	Fourteen RRs adopt new operating code 945.4 KB

St. Paul, MN 12

1928	Burlington Completes Automatic Signals Chicago to Denver 5.1 MB
1963	GN Radio Works in Tunnel 1.1 MB
1928	GN Replaces Semaphores with Color Light Signals 1.2 MB
1947	ICC Holds Signal Hearing 507.5 KB
1947	ICC Signal Hearings 179.7 KB
1965	Midwest RRs fight the weather 914.4 KB
1935	New Signaling on the Route of the C&NW "400" 9.6 MB
1958	News briefs. 1958-01 1.8 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1935	Safety of High Speed Trains 5.2 MB
1935	Signaling for Higher Train Speeds 3.0 MB
1935	The "400" to Run on Six and One Half Hour Schedule 942.0 KB

Stamford, CT 3

1915	Extension of New Haven signals 684.8 KB
1916	Reconstruction of New Haven Signals 315.5 KB
1924	Signal Development in Connection With Single Phase Propulsion 5.1 MB

Standard Code 5

1911	A Comparison of the Interlocking Laws of the Various States 2.6 MB
1935	Multiple Aspect Signaling 3.3 MB
1947	Speed Indicators for High-Speed Turnouts 298.4 KB
1939	The Problem of Medium Speed 835.3 KB
1928	Train Signs or Indicators 468.2 KB

standard plans 1

1921	The Use of a Standard System of Nomenclature 337.6 KB

Standard Signal 2

1954	General Railway Signal Company Enters Fiftieth Year 1.6 MB
1936	T. George Stiles Rounds Out 60 Years of Signaling 2.5 MB

Standard Telephones & Cables 1

1964	Train Describers: A step toward ATI 2.1 MB

Stanley, OH 5

1928	Dispatcher Signaling System Operates Through Sleet Storm 1.1 MB
1928	Electric Plant on NYC Replaces Two Mechanical Plants 3.2 MB
1927	NYC First to Install Complete Train Dispatching System 8.0 MB
1931	Results of Centralized Control on NYC 703.8 KB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB

Staples, Crawford E. 3

1964	AFO can solve highway crossing problems 1.9 MB
1965	AFO circuits can be used in subways 676.7 KB
1959	Recent track circuit developments 1.2 MB

Staples, MN 3

1964	News briefs. 1964-01 535.9 KB
1964	News briefs. 1964-02 992.4 KB
1964	News briefs. 1964-07 833.0 KB

Starck, P. A. 1

1928	Changes on the C&NW 978.4 KB

Starke, FL 1

1965	News briefs. 1965-10 1.1 MB

Starne, IL 1

1945	Manual Block-Remote Control Developed On the Wabash 5.7 MB

starting signals 1

1943	CTC on the Bessemer & Lake Erie 8.7 MB

State Line interlocking 1

1956	Plastic Track Model Is Big Picture for Levermen 1.4 MB

State Line, IN 2

1931	Centralized Traffic Control Installed on Wabash 5.6 MB
1910	Mechanical Interlocking at State Line 1.0 MB

State Line, WI 1

1937	Route Control Interlocking – A New Signaling Development 2.9 MB

Staten Island Rapid Transit 1

1934	Electric Interlocking on Staten Island Lines of the Baltimore & Ohio 1.2 MB

station overlaps 1

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB

station protection signal 1

1947	Hoosac Tunnel Interlocking and CTC 1.7 MB

station protection signals 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

station time control 1

1952	Chicago's Newest Subway Has Automatic Block Signaling and Train Stop 1.1 MB

station time controls 1

1958	Subway consolidates interlockings 2.2 MB

station time signals 2

1944	Automatic Signaling, Train Stop, and Route Interlocking Installed in the Chicago Subways 8.6 MB
1949	Signaling and Interlocking On New Line of New York Subways 6.5 MB

station timers 1

1955	New Cleveland Transit System 917.8 KB

station waiting room automation 1

1958	Kink: Automatic control for waiting room 195.6 KB

stations 1

1936	Annunciator Circuits 2.6 MB

statutes 1

1910	Interlocking Laws in the United States and Canada 821.1 KB

Staunton, CA 1

1926	Train Control Progress in 1925 3.1 MB

Staunton, IL 1

1911	Signaling on the Illinois Traction System 1.5 MB

Staunton, VA 4

1923	C&O Installs Signaling With Train Control 5.8 MB
1928	C&O Signaling and Train Control Facilitate Operation 4.1 MB
1965	News briefs. 1965-01 2.0 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Ste. Rosalie, Quebec 1

1951	Canadian National Installs Centralized Traffic Control On a 117-Mile Sub-Division 501.4 KB

Stecher, C. G. 2

1915	Compensation of Pipe Lines 319.6 KB
1917	The Use of Photography in Signaling 432.5 KB

steel ties 2

1943	Railway Signaling in North Africa 3.5 MB
1965	Rhodesia has 1215 miles of CTC 949.2 KB

Steele, VA 1

1935	Centralized Traffic Control on the Chesapeake & Ohio 6.2 MB

Stella, TX 1

1954	CTC Improves Train Operation 3.3 MB

Sterling Run, PA 1

1937	Ends of Double Track Controlled by CTC 12.4 MB

Sterling, OH 3

1945	Accident at Movable Point Crossing 546.8 KB
1910	The Multiple Unit Electric Interlocking Machine 1.5 MB
1909	Union Switch & Signal’s Inspection Trip 1.5 MB

Sterrett, AL 2

1946	Automatic Block With Spring Switches on the Central of Georgia 5.3 MB
1960	News briefs. 1960-03 1.9 MB

Stevens Point, WI 4

1963	News briefs. 1963-10 497.4 KB
1965	News briefs. 1965-05 1.4 MB
1965	News briefs. 1965-09 381.8 KB
1965	News briefs. 1965-10 1.1 MB

Stevens, T. S. 1

1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB

Stevens, Thomas S. 1

1922	News of the Month. 1922-10 368.4 KB

Stevenson, AL 2

1960	Signal construction steady in 1959 385.2 KB
1955	What CTC did for the Dixie Line 889.8 KB

Steward Jct., IL 2

1930	Burlington Installs Centralized Control on Nine Miles of Double Track 1.8 MB
1943	Centralized Traffic Control Installed on 39 Miles of the Burlington 6.1 MB

stick circuits 1

1956	Interlocking Relays 3.9 MB

Stiles, T. George 1

1936	T. George Stiles Rounds Out 60 Years of Signaling 2.5 MB

Stockholm Spårvägar 2

1965	Japan, Sweden, England test ATO 6.3 MB
1954	Modern Signaling in New Subways in Stockholm, Sweden 6.7 MB

Stockholm subway 1

1963	News briefs. 1963-01 951.3 KB

Stockholm, Sweden 3

1964	Eight cities test automatic train operation 1.1 MB
1965	Japan, Sweden, England test ATO 6.3 MB
1954	Modern Signaling in New Subways in Stockholm, Sweden 6.7 MB

Stockton, CA 5

1947	Annual Review and Outlook 404.7 KB
1962	Automatic Dispatching 2.1 MB
1957	How to make non-stop meet with CTC 576.9 KB
1962	News briefs. 1962-11 468.1 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Stockton, IL 1

1911	Automatic Signals on the Chicago Great Western 7.4 MB

Stoltz, C. F. 1

1940	Personal: Changes on the New York Central 2.2 MB

stop and proceed 2

1921	Stop or Proceed vs. Stop and Proceed 335.2 KB
1921	Stop or Proceed vs. Stop and Proceed [reply] 330.8 KB

stop indication 1

1951	What's the Answer? Stop Signals in CTC 274.3 KB

stop signs 1

1961	News briefs. 1961-03 1.0 MB

Storvik, Sweden 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

Strawberry, KY 1

1947	CTC Down by the Ohio 2.7 MB

streamlined passenger trains 4

1935	Cab Signals and ATC on UP Streamliner 2.1 MB
1936	Demands for Modern Signaling 12.1 MB
1937	Track Shunting Problems 947.3 KB
1937	Track Shunting Problems 2.5 MB

Streator, IL 1

1929	Automatic Interlocker Saves Over 8,000 Train Stops Annually 1.7 MB

Stroudsburg, PA 1

1961	News briefs. 1961-07 648.9 KB

Stryker, MT 1

1922	News of the Month. 1922-06 516.2 KB

Sturtevant, WI 2

1943	Centralized Traffic Control on the Milwaukee 2.8 MB
1964	News briefs. 1964-09 879.4 KB

Style "KP" relays 1

1957	Kinks. Testing "KP" relays 191.2 KB

Style CDP relay 1

1941	Code-Following Polar Track Circuit Relay 1.4 MB

Style P4 relay 1

1941	P4 Code-Following Relay 1.1 MB

Style TR signal 1

1924	A New Triangular Light Signal 1.7 MB

suburban passenger service 1

1963	Signal changes make transit run on railroad 1.1 MB

Sudbury, Ontario 1

1962	News briefs. 1962-06 989.1 KB

Suffern, NY 3

1959	ICC reports on Erie wreck 440.4 KB
1935	New Automatic Signals Increase Track Capacity and Safety on the Erie 6.4 MB
1934	New Signaling Increases Track Capacity on the Erie 2.0 MB

Suffolk, VA 1

1950	Neon Lighting For Crossing Gate Arms 3.1 MB

Sugar City, CO 1

1938	Adapting Signaling to Requirements 1.7 MB

Sugar Land, TX 2

1954	CTC Improves Train Operation 3.3 MB
1961	Should Sidings Have Circuits? 347.6 KB

Suisun Bay, CA 1

1935	Interlocking on Southern Pacific Suisun Bay Bridge 4.6 MB

Sullivan, IN 1

1928	C&EI Installs Automatic Interlocker at Main Line Crossing 3.7 MB

Sunbury, PA 4

1920	Electro-Mechanical Interlocker at Sunbury, PA 538.5 KB
1922	News of the Month. 1922-04 613.8 KB
1924	Results of Train Control Test on Pennsylvania 3.1 MB
1925	Train Operation by Signal Indications – Especially by Cab Signals 1.3 MB

Sunnyside Yards, Queens, NY 1

1933	Signaling Construction During 1932 632.3 KB

Superior, WI 2

1915	Duluth Terminal Trestle Signaling 2.3 MB
1960	News briefs. 1960-01 1.1 MB

Surrey, ND 2

1961	News briefs. 1961-07 648.9 KB
1962	News briefs. 1962-01 986.8 KB

Suspension Bridge, NY 1

1963	News briefs. 1963-03 790.6 KB

Sutton, ND 1

1964	News briefs. 1964-04 1.3 MB

Swanders, OH 1

1954	CTC Moves Heavy Trains 4.1 MB

Swanson, W. W. 1

1925	Train Operation by Signal Indication on Burlington for 14 Years 679.2 KB

Swedeborg, MO 2

1947	Frisco Moves CTC to One Office 481.1 KB
1944	St. Louis-San Francisco Installs Centralized Traffic Control 8.3 MB

Sweden 3

1954	Modern Signaling in New Subways in Stockholm, Sweden 6.7 MB
1937	Railway Signaling by Wireless 1.6 MB
1913	The AGA flashlight a success in Sweden 331.0 KB

Swedish State Railroads 1

1937	Railway Signaling by Wireless 1.6 MB

Swedish State Railway 1

1922	News of the Month. 1922-03 314.9 KB

Swift Current, Saskatchewan 1

1959	Pushbutton console for CTC 785.3 KB

swing-away barriers 1

1965	Crossing protection gets new look 490.1 KB

Swiss Federal Railways 1

1922	Controlled Manual Block in Hauenstein Tunnel 3.4 MB

Swissvale, PA 2

1937	Remote Control on the Pennsylvania 5.2 MB
1913	The Union’s Signaling Exhibition Room 1.5 MB

switch and lock movement 1

1915	Switch and Lock Movements in Mechanical Plants 2.0 MB

switch blocking 1

1959	Pushbutton console for CTC 785.3 KB

switch circuit controllers 3

1940	Facing Point Locks On Main Line Switches 2.6 MB
1935	Inspecting Switch Circuit Controllers 1.7 MB
1935	Switch-Stand Selector 1.9 MB

switch engines 1

1947	Burlington Uses Radio on Switchers 909.1 KB

switch heaters 3

1961	Check Switch Heaters Now 297.3 KB
1955	CTC and cab signaling on Union Pacific 789.5 KB
1965	News briefs. 1965-04 1.5 MB

switch indicators 2

1935	Removal of Switch Indicators 2.3 MB
1937	Switch Indicators Serve as Interlocking Control Devices 5.6 MB

switch lamps 4

1962	Electric Switch Lamp Lighting Helps Reduce Operating Expense 661.7 KB
1937	Electric Switch Lamps on the Santa Fe 4.5 MB
1937	Switch Lamps in Automatic Territory 1.2 MB
1959	What’s the answer? Atomic lamps. 1959-12 194.6 KB

switch locks 3

1950	New Developments 16.9 MB
1941	Protection at Hand-Thrown Switches in CTC Territory 1.6 MB
1943	Signals Ordered on the Kansas City Southern 1.4 MB

switch machine 1

1947	Signaling and Interlocking in Italy 684.8 KB

switch machine controller 1

1950	New Developments 16.9 MB

switch machines 6

1949	Main Line Crossovers 2.4 MB
1959	New GRS switch machines 531.5 KB
1935	Obsolescence in Signaling 3.4 MB
1956	Switch Machines for CTC 2.0 MB
1956	Switch Machines for CTC 985.3 KB
1935	Switch-Stand Selector 1.9 MB

switch points 1

1935	Operating Long Switch Points 2.4 MB

switch protection 2

1941	Protection at Hand-Thrown Switches in CTC Territory 1.6 MB
1937	Switch Protection in Automatic Territory 3.0 MB

switchboards 1

1956	CN Telegraph Moves Into Its New Home 8.1 MB

switches 2

1935	Facing Point Locks on Switches 3.2 MB
1940	Testing Switches 1.1 MB

switching 1

1964	Individual radios carried by crewmen can aid yard work 549.7 KB

switching signals 1

1950	CTC Extended on the Rio Grande 4.4 MB

switchtenders 2

1955	At Portland Terminal, combined interlocking 810.6 KB
1957	Two interlockings save time and money 547.8 KB

Switzerland 2

1922	Controlled Manual Block in Hauenstein Tunnel 3.4 MB
1957	Track circuit developments in Europe 234.8 KB

SY Tower, WV 1

1952	CTC Pays Its Way on B&O 733.2 KB

Sycamore, IL 1

1911	Automatic Signals on the Chicago Great Western 7.4 MB

Sydney, New South Wales, Australia 1

1922	Single Track Signaling in Australia 527.7 KB

Sylacauga, AL 2

1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-04 896.6 KB

symbols 2

1911	Suggestions as to the Standard Symbols 1.9 MB
1911	Symbols and Nomenclature for Written Circuits 2.3 MB

Symington (Winnipeg), Manitoba 1

1962	News briefs. 1962-09 838.3 KB

Syncroscan 1

1964	NYC Moves CTC Point of Control 1.2 MB

Syracuse Jct., NY 1

1936	New York Central Interlocking at Syracuse 15.9 MB

Syracuse, NY 7

1936	All-Relay Interlocking On NYC at Syracuse 29.7 MB
1936	New York Central Interlocking at Syracuse 15.9 MB
1961	News briefs. 1961-01 761.9 KB
1961	News briefs. 1961-07 648.9 KB
1962	News briefs. 1962-04 1.2 MB
1960	Signal construction steady in 1959 385.2 KB
1959	Signaling moderate during '58 528.6 KB

Railway Signaling: S