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 5

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
1940	Entering the Main Line 1.3 MB
1944	Signals Direct Trains at Junction On the Denver & Rio Grande Western and the Denver & Salt Lake 2.8 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

Saginaw, MI 2

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

Salamanca, NY 1

1929	Erie Equips Complete Division with Signals and Interlockers 3.9 MB

Salem, VA 1

1950	Neon Lighting For Crossing Gate Arms 3.1 MB

Salina, KS 1

1935	Safety of High Speed Trains 5.2 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 1

1954	CTC Improves Train Operation 3.3 MB

San Bernardino, CA 1

1947	Railroads Request Relief from the ICC Signal Order 465.0 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, CA 6

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
1935	Safety of High Speed Trains 5.2 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB

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 2

1935	Depression Operation of Interlocking 2.6 MB
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

Sandusky, OH 1

1946	Drawbridge Interlocking on the New York Central 3.1 MB

Santa Ana, CA 1

1947	Railroads Request Relief from the ICC Signal Order 465.0 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

Sapulpa, OK 1

1929	Frisco Installs Semaphores with Color-Light Indication 665.1 KB

Savanna, IL 3

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
1947	More CTC on the Burlington 2.0 MB

Savannah, GA 4

1947	Annual Review and Outlook 425.1 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

Saxby & Farmer 3

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

Scales Mound, IL 1

1942	Automatic Signal Program on the Illinois Central 4.6 MB

scheduling 1

1940	Make-Up-Time Chart 813.1 KB

Schenectady, NY 1

1947	Hoosac Tunnel Interlocking and CTC 1.7 MB

Schiller Park, IL 1

1933	Remote Control on Soo Line 2.7 MB

Schreiber, Ontario 1

1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB

Schwendt, B. J. 2

1937	Changes on the New York Central Lines 2.3 MB
1927	NYC First to Install Complete Train Dispatching System 8.0 MB

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

Seaboard Air Line 25

1947	Annual Review and Outlook 425.1 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
1950	CTC Indication Code 1.2 MB
1954	CTC into Service 2.5 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
1921	New Interlockings at Jacksonville Terminal 3.4 MB
1935	Night Check of Signal Lights 1.2 MB
1947	Railroads Request Relief from the ICC Signal Order 465.0 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
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
1927	Signaling Special Layouts 4.1 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

searchlight signals 43

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
1935	Avoiding Light-Out Signal Failures 1.2 MB
1939	Burlington Replaces Semaphores With Color Lights 3.4 MB
1947	Canadian Pacific Installs Absolute Permissive Block 779.4 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
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
1943	CTC on the Bessemer & Lake Erie 8.7 MB
1937	CTC On the Denver & Rio Grande Western 8.0 MB
1947	Drawbridge Interlocking on the Elgin, Joliet & Eastern 647.3 KB
1947	Hoosac Tunnel Interlocking and CTC 1.7 MB
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
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
1954	NYC Combines Interlockings 2.4 MB
1939	Plug Connector for "H-2" Searchlight Signals 1.1 MB
1935	Repeating Reverse Signal Indication 2.9 MB
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

Seattle, WA 1

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

Sedley, IN 1

1934	CTC Replaces Staff on GTW 2.6 MB

Selbytown, IL 1

1911	Signaling on the Illinois Traction System 1.5 MB

Selinsgrove, PA 1

1924	Results of Train Control Test on Pennsylvania 3.1 MB

Selkirk, NY 1

1927	Color Light Automatic Block Signals Installed on the New York Central 3.6 MB

semaphore controller 1

1940	Controller Adjuster 1.3 MB

semaphore mechanisms 1

1911	Summary of Recent Progress in Signaling 4.4 MB

semaphore signals 28

1935	"Chattering" Slot Arms 2.3 MB
1939	A Message of Confidence 741.8 KB
1947	Annual Review and Outlook 425.1 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 669.9 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
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
1915	Extension of New Haven signals 684.8 KB
1909	Gold Leaf for Signal Blades 351.9 KB
1940	New Searchlight Signal 2.7 MB
1935	Night Check of Signal Lights 1.2 MB
1921	Progress of Railroad Signaling in America 731.8 KB
1943	Railway Signaling in North Africa 3.5 MB
1935	Repeating Reverse Signal Indication 2.9 MB
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
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

semi-automatic interlocking 2

1935	Semi-Automatic Interlocking at a Crossing on the Alton 4.4 MB
1937	Semi-Automatic Interlockings on the Boston Elevated 3.8 MB

semi-automatic signaling 1

1919	Block Signaling Practice on a British Railway (Part 3) 327.2 KB

sequence switch interlocking 1

1953	Route Lever Interlocking on Rock Island 6.5 MB

Seventeenth Street, Chicago, IL 1

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

Shamokin, PA 1

1936	Reading Installs Unique Crossing Protection 9.5 MB

Sharon, OH 1

1942	Chicago's Newest Subway Has Automatic Block Signaling and Train Stop 457.5 KB

Sharon, WI 1

1913	New Block Signaling on the North-Western 1.8 MB

Sheets, R. A. 1

1937	Personal: C&NW 1.3 MB

Shenandoah, VA 1

1926	Train Control Progress in 1925 3.1 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

Shopton, IA 1

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

show sheds 1

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

Shreveport, LA 1

1947	Railroads Request Relief from the ICC Signal Order 465.0 KB

sidings 1

1956	Main Track Leaving Signal 2.2 MB

Sidney, IL 1

1941	Automatics Installed on the Wabash 4.0 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 24

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
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 blueprints 1

1936	Maintainers' Blueprint Plans 4.2 MB

signal colors 5

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
1937	Selection of Colors for Signal Lights 1.3 MB

signal construction 2

1937	Prepare for Construction 1.2 MB
1937	Signaling Construction Methods 2.6 MB

signal failures 2

1950	Continued Improvement In Signal Performance 1.3 MB
1946	Improved Signal Performance 446.8 KB

signal flags 1

1937	Flag and Torpedo Containers 903.1 KB

signal glass 3

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

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 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 5

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

signal lenses 1

1949	A Century of Signal Glass Developments 4.2 MB

signal lighting 3

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

signal maintainers 2

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

signal mechanisms 1

1935	Obsolescence in Signaling 3.4 MB

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 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 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 1

1935	The Rudd-Rhea Signaling Report of the Pennsylvania 9.7 MB

signal testing 3

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

signal training 1

1943	Instructions in Signal Aspects and Indications to New Employees 5.6 MB

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

Silvis, 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

Sinclair, MT 1

1937	Automatic Plant Replaces Mechanical Interlocking 1.3 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 425.1 KB
1946	CTC on 107 Miles of Single Track on the Louisville & Nashville 5.2 MB

Sir Johns Run, WV 1

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

Skokie Jct., IL 1

1926	North Shore Line Installs Two Electric Interlockers 2.1 MB

Slaton, TX 1

1947	Railroads Request Relief from the ICC Signal Order 465.0 KB

slide detector fences 2

1947	107 Miles of CTC on the N&W 2.3 MB
1936	Slide Detector Fences 4.3 MB

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

snow melters 1

1956	Snow Melters 2.6 MB

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

Somerset, KY 1

1924	Three Train Control Contracts Let 1.9 MB

Somerville, TX 1

1922	Signal Construction on the Santa Fe 797.6 KB

Soo Line 4

1949	192 Miles of Automatic Block On Soo Line 6.0 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

Sorrento, CA 1

1947	Railroads Request Relief from the ICC Signal Order 465.0 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 Amboy, NJ 2

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

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 Branch Bridge 1

1931	One Electric Interlocking for Two Drawbridges 3.1 MB

South Chicago, IL 2

1947	Drawbridge Interlocking on the Elgin, Joliet & Eastern 647.3 KB
1956	Length of Train Selects Control of Crossing Gates on Illinois Central 4.6 MB

South Denver, CO 2

1950	Automatic Block Increases Safety on Paired Trackage 4.6 MB
1947	Railroads Request Relief from the ICC Signal Order 465.0 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 Joliet, IL 2

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

South Mt. Vernon, NY 1

1924	Signal Development in Connection With Single Phase Propulsion 5.1 MB

South Street, PA 1

1935	Automatic Interlocking on the Philadelphia Elevated 6.1 MB

South Upton, IL 1

1926	North Shore Line Installs Two Electric Interlockers 2.1 MB

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 45

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
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
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
1919	Electric Interlocking at Charlottesville,VA 530.2 KB
1935	Facing Point Locks on Switches 3.2 MB
1937	Height of Light Signals 1.0 MB
1946	ICC 50-MPH Signal Hearing 6.9 MB
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
1921	New Interlockings at Jacksonville Terminal 3.4 MB
1954	New Orleans Passenger Terminal 4.7 MB
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
1928	Signal and Train Control Hearing Ends 2.0 MB
1928	Signal Aspects for "Head-In" Indication at Passing Track 1.0 MB
1928	Signals Should Keep Trains Moving 400.7 KB
1936	Slide Detector Fences 4.3 MB
1937	Switch Protection in Automatic Territory 3.0 MB
1947	Territories Involved in the ICC Signaling Order 399.0 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 Pacific 74

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
1935	Automatic Interlocking Involves Highway Crossing Signals 3.4 MB
1928	Automatic Signals Within Yard Limits 1.0 MB
1923	Cabin Interlockings for Crossings 1.5 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
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
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
1946	ICC 50-MPH Signal Hearing 6.9 MB
1947	ICC Holds Signal Hearing 507.5 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
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
1946	More Difficult to Get a Call-On Signal 488.8 KB
1936	Motor Car Indicators 2.9 MB
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
1956	Photography 1.5 MB
1931	Protecting CTC Switches 2.9 MB
1944	Railroad Applications of Electronics 1.9 MB
1947	Railroads Request Relief from the ICC Signal Order 465.0 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
1935	Removal of Switch Indicators 2.3 MB
1939	Repairing Spring Switch Mechanisms 1.8 MB
1935	Repeating Reverse Signal Indication 2.9 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
1925	Signaling of Paired Track Operation 1.3 MB
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
1954	SP Modernizes Automatic Block 2.0 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
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
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

Southern Pines, NC 1

1935	Remote Control on the Seaboard 5.4 MB

Southern Railway 1

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

Southport Jct., LA 1

1936	New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans 7.9 MB

Southport, LA 1

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

Sparta, MN 1

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

Spartanburg, SC 1

1953	CTC Keeps Trains Moving on Long Grades 6.3 MB

Spaulding, IL 2

1958	CTC Handles 15 More Trains 1.9 MB
1938	EJ&E Installs APB Signaling 3.1 MB

speed checker 1

1949	Yardsticks 947.2 KB

speed control 1

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

speeds 1

1937	Track Layout for CTC 1.2 MB

Spencer, NC 1

1924	Three Train Control Contracts Let 1.9 MB

Spencer, WI 2

1949	192 Miles of Automatic Block On Soo Line 6.0 MB
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

Spokane, Portland & Seattle 1

1947	Territories Involved in the ICC Signaling Order 399.0 KB

Spokane, WA 1

1956	When Dispatchers Move ... Carrier Saves Wire Pair 1.3 MB

spring switches 32

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
1956	Burlington Has Modified CTC for Medium Traffic Single-Track 7.2 MB
1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB
1942	Chicago's Newest Subway Has Automatic Block Signaling and Train Stop 457.5 KB
1944	Coded Track Circuits for CTC and Cab Signaling 4.0 MB
1937	CTC in Coaling Station Territory 6.6 MB
1936	Demands for Modern Signaling 12.1 MB
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
1949	ICC Issues Statistics 850.7 KB
1944	L&N Installs CTC On an Engine District 9.0 MB
1937	Location of Signals at Spring Switches 1.3 MB
1950	New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB
1951	P&WV Signals Entire Main Line 3.9 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
1935	Signaling at Spring Switches 2.6 MB
1938	Signaling at Spring Switches 930.3 KB
1945	Signaling for Spring Switches 579.1 KB
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

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

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 2

1950	Frisco Moves CTC Machines Without Interrupting Traffic 2.9 MB
1950	Modern Communications In Yards and Terminals 1.4 MB

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. 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. Joe, IN 1

1950	CTC on the Wabash 2.6 MB

St. Joseph, MI 2

1949	Modern Signaling on a Division 6.6 MB
1946	Pere Marquette Installs CTC 3.1 MB

St. Lambert, Quebec 1

1943	Canadian National Installs a Large All-Relay Electric Interlocking 8.8 MB

St. Louis Southwestern 12

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
1947	Railroads Request Relief from the ICC Signal Order 465.0 KB
1936	Reconstruction of Interlocking at the Dallas Union Terminal 14.8 MB
1928	Signal and Train Control Hearing Ends 2.0 MB
1941	Signaling on 47 Miles of St. Louis Southwestern 12.6 MB
1944	St. Louis Southwestern Installs Centralized Traffic Control 6.9 MB
1947	Territories Involved in the ICC Signaling Order 399.0 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

St. Louis Southwestern of Texas 1

1947	Territories Involved in the ICC Signaling Order 399.0 KB

St. Louis Union Station 1

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 399.0 KB

St. Louis, MO 22

1931	A Lesson from a False-Clear Failure 572.9 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
1957	Consolidation Cuts Costs 3.1 MB
1956	Crossing Protection In Industrial Area 3.1 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
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
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 & Texas 1

1947	Territories Involved in the ICC Signaling Order 399.0 KB

St. Louis-San Francisco 38

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
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
1933	Frisco Uses Semaphores With Color Light Indication 1.1 MB
1956	Interlocking Phones 2.3 MB
1934	Lamp Ratings for Flashing Lights 695.8 KB
1950	Modern Communications In Yards and Terminals 1.4 MB
1956	New Three-Track Interchange Includes Interlocking and Talk-Backs 8.9 MB
1956	NX Control Replaces Lever Machine 2.8 MB
1937	Railroad Grade Crossing Gates 2.2 MB
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
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
1944	St. Louis-San Francisco Installs Centralized Traffic Control 8.3 MB
1956	Switch Machines for CTC 2.0 MB
1947	Territories Involved in the ICC Signaling Order 399.0 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
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
1928	Why Markers for Automatic Signals? 494.6 KB

St. Luc, Quebec 1

1950	Consolidation of Interlockings 2.5 MB

St. Paul, MN 8

1928	Burlington Completes Automatic Signals Chicago to Denver 5.1 MB
1928	GN Replaces Semaphores with Color Light Signals 1.2 MB
1947	ICC Holds Signal Hearing 507.5 KB
1935	New Signaling on the Route of the C&NW "400" 9.6 MB
1947	Railroads Request Relief from the ICC Signal Order 465.0 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 2

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

Standard Code 4

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

Stanley, OH 4

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

Starck, P. A. 1

1928	Changes on the C&NW 978.4 KB

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 protection signal 1

1947	Hoosac Tunnel Interlocking and CTC 1.7 MB

station time control 1

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

stations 1

1936	Annunciator Circuits 2.6 MB

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 2

1923	C&O Installs Signaling With Train Control 5.8 MB
1928	C&O Signaling and Train Control Facilitate Operation 4.1 MB

steel ties 1

1943	Railway Signaling in North Africa 3.5 MB

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 1

1946	Automatic Block With Spring Switches on the Central of Georgia 5.3 MB

Stevens, T. S. 1

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

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

Stockholm Spårvägar 1

1954	Modern Signaling in New Subways in Stockholm, Sweden 6.7 MB

Stockholm, Sweden 1

1954	Modern Signaling in New Subways in Stockholm, Sweden 6.7 MB

Stockton, CA 2

1947	Annual Review and Outlook 425.1 KB
1947	Railroads Request Relief from the ICC Signal Order 465.0 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

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

Sturtevant, WI 1

1943	Centralized Traffic Control on the Milwaukee 2.8 MB

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

Styles, T. George 1

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

Suffern, NY 2

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 1

1954	CTC Improves Train Operation 3.3 MB

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 3

1920	Electro-Mechanical Interlocker at Sunbury, PA 538.5 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

Superior, WI 1

1915	Duluth Terminal Trestle Signaling 2.3 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 1

1944	St. Louis-San Francisco Installs Centralized Traffic Control 8.3 MB

Sweden 2

1954	Modern Signaling in New Subways in Stockholm, Sweden 6.7 MB
1913	The AGA flashlight a success in Sweden 326.2 KB

Swedish State Railroads 1

1937	Railway Signaling by Wireless 1.6 MB

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 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 indicators 2

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

switch lamps 2

1937	Electric Switch Lamps on the Santa Fe 4.5 MB
1937	Switch Lamps in Automatic Territory 1.2 MB

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 5

1949	Main Line Crossovers 2.4 MB
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 signals 1

1950	CTC Extended on the Rio Grande 4.4 MB

Switzerland 1

1922	Controlled Manual Block in Hauenstein Tunnel 3.4 MB

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

symbols 2

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

Syracuse Jct. 1

1936	New York Central Interlocking at Syracuse 15.9 MB

Syracuse, NY 2

1936	All-Relay Interlocking On NYC at Syracuse 29.7 MB
1936	New York Central Interlocking at Syracuse 15.9 MB

Railway Signaling: S

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