Railway Signaling | P

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.

P&LE Gateway Yard, Youngstown, OH 1

1959	Communications is everywhere at P&LE's Gateway Yard in Youngstown, Ohio 2.1 MB

Pacific Electric 5

1964	News briefs. 1964-10 768.6 KB
1965	News briefs. 1965-01 2.0 MB
1943	Pacific Electric Installs a Large All-Relay Interlocking 5.3 MB
1928	Pacific Electric Protects Subway Traffic With Signals and Train Stops 2.4 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Pacific Great Eastern 1

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

Pacific Jct., IA 2

1955	CTC on single and double track 406.8 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Pacific Jct., IL 1

1942	Milwaukee Replaces Mechanical Plant With All-Relay Electric Interlocking 5.7 MB

Pacific Jct., MT 3

1960	News briefs. 1960-01 1.1 MB
1961	News briefs. 1961-06 725.8 KB
1962	News briefs. 1962-01 986.8 KB

Packerton, PA 1

1965	News briefs. 1965-07 788.3 KB

Paddington, Manitoba 1

1955	News briefs. 1955-08 830.4 KB

Paducah & Illinois 1

1930	Signal Indications Direct Trains on the Paducah & Illinois 5.0 MB

Paducah, KY 2

1937	Ohio Flood Damages Signaling 9.7 MB
1930	Signal Indications Direct Trains on the Paducah & Illinois 5.0 MB

Page Ave., St. Louis, MO 1

1908	Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis 7.2 MB

Painesville, OH 2

1955	News briefs. 1955-08 830.4 KB
1922	News of the Month. 1922-04 613.8 KB

Palestine, TX 1

1948	New Signaling In Texas on Missouri Pacific Lines 1.8 MB

Palm Springs, CA 1

1957	How long sidings save train time 465.2 KB

Palmer Lake, CO 1

1950	Automatic Block Increases Safety on Paired Trackage 4.6 MB

Palmyra, MO 1

1959	Burlington installs modified CTC 1.0 MB

Pamplin, VA 2

1960	News briefs. 1960-05 1.0 MB
1960	News briefs. 1960-10 1.8 MB

Pana, IL 2

1929	Big Four Improves Operation by Remote Control 2.5 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Panama 1

1927	Additional Solutions to Call-On Signal Circuit Problem 2.8 MB

Panhandle & Santa Fe 1

1963	News briefs. 1963-01 951.3 KB

Paola, KS 2

1955	Both ways on both tracks with CTC 765.0 KB
1962	News briefs. 1962-07 494.2 KB

Paoli, PA 4

1915	Beam-Light Signals on the Pennsylvania 318.8 KB
1938	Pennsylvania Electrification Signaling 5.3 MB
1916	Service Record of Position-Light Signals 580.8 KB
1933	Signaling on the Pennsylvania's Electrified Line 3.6 MB

Paradise, MT 2

1965	News briefs. 1965-01 2.0 MB
1966	News briefs. 1966-01 1.4 MB

Paragould, AR 1

1957	Why Cotton Belt installed CTC on entire main line 914.0 KB

Paralta, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Paris Transport 1

1964	Automatic identity systems proposed 736.1 KB

Paris, France 3

1908	A New 10,000 Line Telephone Exchange for Paris, France 2.2 MB
1923	Automatics on Paris Grande Ceinture 5.0 MB
1964	Eight cities test automatic train operation 1.1 MB

Paris, KW 1

1959	L&N installs hot box detector 480.3 KB

Park City, KY 1

1964	News briefs. 1964-08 811.5 KB

Park Jct., PA 2

1944	Light-Type Signals Installed on the Reading 6.3 MB
1961	Railroad Will Pay For CTC Out Of Accrued Savings 842.9 KB

Parkersburg, WV 5

1937	APB, Remote Control, and CTC on the Baltimore & Ohio 11.9 MB
1952	CTC Pays Its Way on B&O 733.2 KB
1951	More Signal Construction in 1950 1.0 MB
1937	Ohio Flood Damages Signaling 9.7 MB
1929	Trains on Baltimore & Ohio Operate by Signal Indication Over Single-Track Lines 2.7 MB

Parkesburg, PA 1

1938	Pennsylvania Electrification Signaling 5.3 MB

Parkway, IL 1

1913	Illinois Central Alternating Current Signaling 2.5 MB

Parma, OH 1

1964	News briefs. 1964-09 879.4 KB

Parsons Yard, OH 1

1950	Remote Control of Center Sidings On Busy Double-Track Line 3.6 MB

Parsons, KS 1

1938	AC Primary on the Katy 442.5 KB

Pasco, WA 2

1964	News briefs. 1964-12 981.5 KB
1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

passenger reservations 1

1950	Reservations Communication System Installed On the Pennsylvania 3.9 MB

passenger terminals 1

1950	Passenger Terminal Signals 993.8 KB

passenger trains 1

1947	Signaling Order Issued by ICC 533.4 KB

passing sidings 1

1940	"Running" Passing Tracks 1.1 MB

Patenall, F. P. 6

1909	Gold Leaf for Signal Blades 351.9 KB
1922	Lights vs. Arms for Railway Signaling 4.6 MB
1928	Obituary: Frank P. Patenall 627.0 KB
1928	Personal Mention: G. H. Dryden 432.7 KB
1921	Proposed Modification of Stop-and-Proceed Rule 1.4 MB
1908	The Electro-Pneumatic Signal and Interlocking System at the New Union Station, Washington, DC 4.5 MB

Paterson, NJ 1

1958	News briefs. 1958-01 1.8 MB

Patterson Creek, WV 1

1961	News briefs. 1961-07 648.9 KB

Paulina Jct., Chicago, IL 1

1954	Junction Controlled Automatically 2.5 MB

Pauline, KS 1

1958	Santa Fe tests AF track circuits 1.6 MB

Paulista 1

1961	Brazilian Automated CTC Will Make Meets 1.2 MB

Pauls Valley, OK 1

1922	Signal Construction on the Santa Fe 797.6 KB

Pavonia, NJ 1

1938	Pennsylvania Electrification Signaling 5.3 MB

Pawnee, NE 2

1922	News of the Month. 1922-06 516.2 KB
1922	News of the Month. 1922-07 346.9 KB

Peach Creek, WV 1

1941	Automatic Block and Centralized Traffic Control on the Chesapeake & Ohio 4.3 MB

pedestal signals 1

1947	How Low Is a Dwarf? 438.7 KB

Pee Dee, SC 2

1962	News briefs. 1962-05 826.8 KB
1962	News briefs. 1962-06 989.1 KB

Peekskill, NY 1

1962	News briefs. 1962-02 1.4 MB

Peerless Manufacturing 1

1935	Snubbing Relay for Semaphores 1.0 MB

Pekin, IL 3

1943	All-Relay Interlocking Replaces Mechanical Plant 9.3 MB
1931	Centralized Traffic Control on the Peoria & Pekin Union 6.7 MB
1950	OSing Device 1.4 MB

Pelham Bay Line, New York, NY 1

1950	Route Type Interlocking on New York Subway 8.7 MB

pendulum type code transmitters 1

1940	Plug Couplers for Relays and Signals 1.3 MB

Penn, Philadelphia, PA 2

1952	Pennsylvania Railroad Installs Large Modern Interlocking at Passenger Station in Philadelphia 1.6 MB
1931	Signaling the Philadelphia Terminal of the Pennsylvania 8.9 MB

Pennock, MN 2

1934	Ends of Double Track Equipped With Automatic Interlocking 987.5 KB
1957	GN CTC's 175 miles of mainline 635.9 KB

Pennslvania 1

1955	Pennsylvania installs wayside equipment for cab signaling 745.7 KB

Pennsylvania 234

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1940	11,000-Ft. Coded Track Circuits 13.6 MB
1925	A movement was begun 604.7 KB
1933	A New Deal on Train Control 639.0 KB
1911	A Summary of Signaling Practice 3.6 MB
1925	A. H. Rudd Discusses Train Control at Philadelphia Engineers' Club 2.8 MB
1949	A. H. Rudd obituary 947.2 KB
1937	A. H. Rudd Retires 1.6 MB
1929	Adjustment of Clockwork Time Releases 1.4 MB
1959	AFO circuits protect crossing 554.0 KB
1937	Approach Indications to Train Order Signals 4.2 MB
1929	Are Automatic Signals on Sidings Justified? 1.6 MB
1921	Aspects of the Position Light Signal 203.5 KB
1922	Automatic Train Control in Use On American Railroads 353.7 KB
1957	Automation yard control on the Pennsylvania 882.0 KB
1951	B&O Installs Modern Interlocking 871.3 KB
1936	Bad Collisions on Best Railroads 2.5 MB
1915	Beam-Light Signals on the Pennsylvania 318.8 KB
1929	C&EI Derailment and Collision at Chicago 755.9 KB
1936	Cab Signaling 7.8 MB
1933	Call-On Signals 930.2 KB
1933	Call-On Signals (editorial) 1.0 MB
1946	Carryphone on the Pennsylvania 1.5 MB
1934	Centralized Traffic Control Installed on the Alton 1.1 MB
1931	Centralized vs. Remote Control 1.2 MB
1937	Changes on the Pennsylvania 1.6 MB
1933	Checking the "D" Relay 440.2 KB
1947	Choice of Interlocking Control Machines 266.5 KB
1931	Circuit for Signal Demonstration 490.2 KB
1935	Coded Track Circuit Signaling on the Pennsylvania 9.8 MB
1959	Computer simulates train operation 524.0 KB
1956	Conelrad – A Civil Defense Measure … How Some Railroads are Participating 4.1 MB
1947	Construction of Towers 213.3 KB
1933	Control of Signals at Dual-Control Switches 891.3 KB
1929	Control Schemes for Take-Siding Indicators 360.3 KB
1934	Crossing Gate With Light Signals Installed at Railroad Crossing 1.0 MB
1955	Crossing protection for 16 streets 371.1 KB
1947	Crossing Protection in Gary, Indiana 1.6 MB
1952	CTC Machine Hangs High But Trains Run 704.9 KB
1947	CTC Saves Train Time on the Pennsylvania 1.5 MB
1927	Derail Failure Results in Collision on Crossing 995.6 KB
1931	Derails in Passing Sidings 1.1 MB
1921	Derails: Are They Good or Bad? 350.6 KB
1937	Direct-Wire or Coded Circuits 1.3 MB
1926	Directing Trains By Signals 1.9 MB
1936	Double-Caution Signaling 3.4 MB
1927	Electric Locking Protection at Interlockers Operated Without Derails 1.1 MB
1962	Electric Switch Lamp Lighting Helps Reduce Operating Expense 661.7 KB
1920	Electro-Mechanical Interlocker at Sunbury, PA 538.5 KB
1915	Emergency Suburban Traffic 252.9 KB
1937	Ends of Double Track Controlled by CTC 12.4 MB
1945	Extensive All-Relay Interlocking Features Plug-In Relays 5.6 MB
1935	Facing Point Locks on Switches 3.2 MB
1915	First Position Light Signal Installation 580.6 KB
1936	Flood Damage to Signaling 5.0 MB
1922	Four Position Signaling 859.8 KB
1933	Four-Position Dwarfs 1.5 MB
1935	FPL Adjustment on Spring Switches 1.3 MB
1941	Frank Rhea (obituary) 1.0 MB
1938	Grade Signal Markers 596.4 KB
1950	High Speed Turnout Signaling 2.3 MB
1947	Highway Crossing Protection Installed by Several Railroads in Gary, IndianaR 1.2 MB
1959	Hot box detector sets signals 1.2 MB
1947	How Low Is a Dwarf? 438.7 KB
1946	ICC 50-MPH Signal Hearing 6.9 MB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1950	Increasing Use of Carrier 1.3 MB
1944	Inductive Train Communication 3.9 MB
1935	Installation of Bond Wires 4.0 MB
1936	Interlocking and Remote Control on Erie 18.9 MB
1938	Interlocking Changes on the Pennsylvania 4.9 MB
1961	Interlocking Costs 293.9 KB
1950	Interlocking Plant Horns 2.3 MB
1956	Interlocking Relays 3.9 MB
1952	Interlockings Modernized at Three Railroad Crossings 974.7 KB
1937	J. C. Mock Retires 1.4 MB
1920	Largest Saxby & Farmer Machine in the United States 1.6 MB
1935	Letter to the Editor- Comment on Multiple Aspects 1.5 MB
1920	Light Signals to Supplant the Semaphore 7.0 MB
1925	Light Signals, Color, Position, or Color-Position 1.5 MB
1933	Lock Releasing 469.9 KB
1936	Lost Motion in Locking 3.0 MB
1954	Loudspeakers and Interlocking Improve Yard Operation 4.7 MB
1949	Main Line Crossovers 2.4 MB
1938	Milwaukee Rehabilitates Large Plant 8.0 MB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1957	More automation for signaling in 1957 1.2 MB
1931	Movable Bridges and Yard Entrance Layouts Controlled from One Cabin 4.5 MB
1936	New Electro-Pneumatic Plant On Pennsylvania at Newark 23.9 MB
1947	New Interlocking at Bellevue, Ohio Protects Crossings of Four Railroads 997.9 KB
1930	New Interlocking on Pennsylvania at Harrisburg Replaces Three Old Plants 2.3 MB
1922	New Interlocking on the CRR of NJ 734.1 KB
1937	New Signaling on Pennsylvania 1.0 MB
1916	New York Central and Pennsylvania Change Colors 220.3 KB
1955	News briefs. 1955-08 830.4 KB
1959	News briefs. 1959-05 506.5 KB
1960	News briefs. 1960-02 995.4 KB
1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-05 1.0 MB
1961	News briefs. 1961-07 648.9 KB
1961	News briefs. 1961-12 978.0 KB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-03 1.1 MB
1963	News briefs. 1963-01 951.3 KB
1963	News briefs. 1963-10 497.4 KB
1964	News briefs. 1964-05 1.0 MB
1964	News briefs. 1964-11 797.3 KB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-02 1.9 MB
1965	News briefs. 1965-04 1.5 MB
1965	News briefs. 1965-06 1.2 MB
1965	News briefs. 1965-07 788.3 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. 1922-07 346.9 KB
1922	News of the Month. 1922-11 361.5 KB
1922	News of the Month. 1922-12 388.1 KB
1923	News of the Month. 1923-10 1.9 MB
1941	Non-Stop Permissive Signals 2.8 MB
1915	North Philadelphia Interlocking 828.9 KB
1959	Now: Instant hotbox location 829.3 KB
1937	Ohio Flood Damages Signaling 9.7 MB
1931	Oil or Electric Switch Lamps? 1.8 MB
1935	Operating Long Switch Points 2.4 MB
1927	Organization of Railroad Signal Departments 3.9 MB
1941	P. M. Gault obituary 1.2 MB
1937	Pennsylvania CTC Installation 7.0 MB
1931	Pennsylvania Cuts Over Large Interlocking Plant Without Delaying Traffic 2.6 MB
1938	Pennsylvania Electrification Signaling 5.3 MB
1951	Pennsylvania Exhibits Speed Control 512.5 KB
1928	Pennsylvania Installs an Interlocking Without Derails 2.3 MB
1929	Pennsylvania Installs APB Signaling on 86 Miles 3.7 MB
1930	Pennsylvania Installs Centralized Control on 30.3 Miles of Single Track 1.7 MB
1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB
1928	Pennsylvania Installs Code System of Train Stop with Signaling 5.7 MB
1941	Pennsylvania Installs CTC at Louisville, KY 4.9 MB
1944	Pennsylvania Installs CTC On 53 Miles of Busy Single Track 8.5 MB
1929	Pennsylvania Installs Interlocking at Lancaster, PA 3.6 MB
1952	Pennsylvania Railroad Installs Large Modern Interlocking at Passenger Station in Philadelphia 1.6 MB
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
1930	Pennsylvania Uses Remote Control for Switches 1.1 MB
1935	Pole Lines for Automatic Signaling 1.6 MB
1931	Preparation of Signal Circuit Plans 2.0 MB
1935	Preventing Unnecessary Operation of Highway-Railroad Crossing Signals 4.3 MB
1943	Progress in the Use of Coded Track Circuits 1.6 MB
1921	Proposed Modification of Stop-and-Proceed Rule 1.4 MB
1931	Protecting CTC Switches 2.9 MB
1927	Protecting Main Line Switches 486.2 KB
1941	Protection at Hand-Thrown Switches in CTC Territory 1.6 MB
1925	PRR construction (Lima, et al): News of the Month (July 1925) 675.8 KB
1965	PRR converts two hump yards 630.5 KB
1965	PRR upgrades yard, improves service 1.2 MB
1923	Quick Restoration of Wire Service at Broad Street Station 3.5 MB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1936	Railroads Clean Up After Flood Waters 33.3 MB
1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB
1911	Recent Improvements in Signaling 856.5 KB
1918	Record Snowstorms Paralyze Transportation 424.7 KB
1937	Rehabilitating Flooded Signaling 1.4 MB
1925	Relieving Congestion by Signals 2.5 MB
1947	Remote Control on Baltimore & Ohio 595.8 KB
1936	Remote Control on the Pennsylvania 14.5 MB
1937	Remote Control on the Pennsylvania 5.2 MB
1937	Report of Committee X – Signaling Practice 2.9 MB
1950	Reservations Communication System Installed On the Pennsylvania 3.9 MB
1935	Respacing Automatics on the Pennsylvania 1.8 MB
1924	Results of Train Control Test on Pennsylvania 3.1 MB
1946	Reverse Running on the Pennsylvania 2.8 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1937	Rule for Crossing Protection 1.2 MB
1935	Safety of High Speed Trains 5.2 MB
1916	Service Record of Position-Light Signals 580.8 KB
1913	Settled at Last 824.8 KB
1930	Should Signal Clear? 1.2 MB
1928	Signal Aspects for "Head-In" Indication at Passing Track 1.0 MB
1930	Signal Aspects for a Four Block System 2.8 MB
1951	Signal Modernization Program on the RF&P 1.0 MB
1935	Signal Night for New York Railroad Club 1.1 MB
1933	Signal Publicity 666.2 KB
1933	Signaling Construction During 1932 632.3 KB
1931	Signaling for Electrified Operation 3.5 MB
1935	Signaling for Higher Train Speeds 3.0 MB
1939	Signaling for the Army-Navy Game 1.0 MB
1911	Signaling on the New York Tunnel Extension of the Pennsylvania 1.0 MB
1933	Signaling on the Pennsylvania's Electrified Line 3.6 MB
1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB
1931	Signaling the Philadelphia Terminal of the Pennsylvania 8.9 MB
1958	Signaling to cut expenses in '58 411.4 KB
1937	Signals in Advance of Switches 1.1 MB
1951	Simple Interlocking Saves Many Train Stops 375.6 KB
1933	Simplified Interlocking Installed at the Dayton Terminal 700.6 KB
1936	Slide Detector Fences 4.3 MB
1936	Slide Detector Signals 12.9 MB
1916	Some Examples of Early Signaling 351.5 KB
1937	Spring Switch at Branch Line Terminus 5.0 MB
1950	Spring Switch Signaling 2.5 MB
1950	Stopping Distance on Grades 3.5 MB
1951	Street and Railroad Crossing Protection Combined 529.9 KB
1957	Survey shows progress in signal education 330.6 KB
1961	Survey Tells How Railroads Use Hotbox Detectors 1.8 MB
1950	Temporary Change of Signal Controls 2.2 MB
1936	Testing New Interlocking 3.5 MB
1921	The Development of Position Light Signals 830.7 KB
1926	The Direction of Train Movements by Signal Indication Without Written Train Orders 829.5 KB
1908	The Electro-Pneumatic Signal and Interlocking System at the New Union Station, Washington, DC 4.5 MB
1938	The Outlook for Signaling 1.3 MB
1925	The Position Light Signal 1.7 MB
1911	The Principles of Railway Signaling 3.5 MB
1935	The Rudd-Rhea Signaling Report of the Pennsylvania 9.7 MB
1925	The Train Control Situation 853.0 KB
1926	Train Control Progress in 1925 3.1 MB
1925	Train Operation by Signal Indications – Especially by Cab Signals 1.3 MB
1927	Train Operation Without Written Train Orders 3.3 MB
1954	Train Operations When CTC Fails 2.0 MB
1944	Train Telephone Communication 4.1 MB
1923	Train-Order Signals at Interlockers 3.6 MB
1915	Trenton Electro-Mechanical Interlocking 1.7 MB
1934	Use of Dwarf Calling-On Signals 1.0 MB
1934	Use of Marker Lamps 516.1 KB
1946	W. M. Post retires 932.3 KB
1925	W. M. Post: News of the Month (July 1925) 775.5 KB
1936	What Is the Capacity of a Single-Track Line? 2.0 MB
1929	What Kind of Control for Take-Siding Signals? 512.5 KB
1920	What Scheme of Signaling is Most Desirable? 6.8 MB
1958	What's the answer? Approach lighting 237.1 KB
1960	What's the answer? Dwarf signals 511.5 KB
1958	What's the answer? Snow on signals 711.5 KB
1960	What's the answer? Snow shields 424.6 KB
1961	What’s the Answer? 1961-04 960.3 KB
1959	What’s the answer? Atomic lamps. 1959-12 194.6 KB
1929	Where Should Grade Signals Be Installed? 1.2 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Pennsylvania Central 1

1922	The Red Light 624.5 KB

Pennsylvania Station, New York, NY 2

1911	Recent Improvements in Signaling 856.5 KB
1911	Signaling on the New York Tunnel Extension of the Pennsylvania 1.0 MB

Pennsylvania-New York Central merger 1

1962	News briefs. 1962-08 675.9 KB

Pennsylvania-Reading Seashore Lines 2

1965	News briefs. 1965-01 2.0 MB
1950	Passenger Terminal Signals 993.8 KB

Pennsyvania 1

1964	News briefs. 1964-06 812.0 KB

Pensacola, FL 1

1962	Trains Control Automatic Bridge 1.2 MB

Penticton, British Columbia 1

1947	Canadian Pacific Installs Absolute Permissive Block 774.8 KB

Pentwater, MI 1

1922	News of the Month. 1922-03 314.9 KB

Peoria & Eastern 1

1947	All-Relay Plant on the C&EI at Danville, Ill 915.6 KB

Peoria & Pekin Union 5

1943	A Review of 1942 2.9 MB
1943	All-Relay Interlocking Replaces Mechanical Plant 9.3 MB
1931	Centralized Traffic Control on the Peoria & Pekin Union 6.7 MB
1933	Economics of Modern Signaling 2.1 MB
1933	The Benefits of Either-Direction Signaling 473.1 KB

Peoria, IL 4

1931	Centralized Traffic Control on the Peoria & Pekin Union 6.7 MB
1937	Rock Island Installs Automatic Blocks 10.1 MB
1924	Rock Island Installs Train Control 847.9 KB
1911	Signaling on the Illinois Traction System 1.5 MB

Peoria, OH 1

1965	News briefs. 1965-06 1.2 MB

Peosta, IA 1

1942	Automatic Signal Program on the Illinois Central 4.6 MB

Peotone, IL 2

1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-09 562.2 KB

Pequot, IL 2

1934	Centralized Traffic Control Installed on the Alton 1.7 MB
1927	Santa Fe Is Operating Trains by Cab Signaling With Train Control 6.4 MB

Perdido, AL 1

1964	News briefs. 1964-08 811.5 KB

Pere Marquette 30

1929	Are Automatic Signals on Sidings Justified? 1.6 MB
1944	Canadian Pacific Installs Centralized Traffic Control 4.4 MB
1947	Choice of Interlocking Control Machines 266.5 KB
1935	Circuit for Flashing Light Signals 3.5 MB
1945	CTC Solves Operating Problems On the Pere Marquette 4.3 MB
1930	Directional Approach Lighting 449.8 KB
1946	DT&I Tests Radio 4.3 MB
1933	Economics of Modern Signaling 2.1 MB
1938	Electric Switch Heaters at Rock Island Interlocking 1.8 MB
1937	Gages for Mechanical Locking 2.4 MB
1949	Hold-Out Signals in CTC 1.0 MB
1949	Modern Signaling on a Division 6.6 MB
1915	New Interlockers on the Flint Belt Line 2.2 MB
1923	New Interlockers on the Flint Belt Line 1.6 MB
1922	News of the Month. 1922-03 314.9 KB
1922	News of the Month. 1922-09 562.2 KB
1922	News of the Month. 1922-10 368.4 KB
1928	Pere Marquette Installs Centralized Control Signal System 3.2 MB
1946	Pere Marquette Installs CTC 3.1 MB
1920	Pere Marquette Resort Special in Head-On Collision 354.4 KB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1930	Report of Committee I – Economics of Signaling 2.5 MB
1928	Signal Aspects for "Head-In" Indication at Passing Track 1.0 MB
1934	Signals at Automatic Interlockers 378.1 KB
1945	Teaching the Meaning of Signal Aspects 431.7 KB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1920	The Use of Signals for Better Train Operation (Part 2 of 2) 7.3 MB
1930	Time-Table Schedules and Signal Indications 1.1 MB
1926	Train Control Progress in 1925 3.1 MB
1946	War-Time Replacement of Interlocking on Pere Marquette 3.4 MB

Pereyra, Argentina 1

1960	News briefs. 1960-06 1.2 MB

Pergo, OH 1

1950	CTC on the Wabash 2.6 MB

Perham, MN 3

1961	News briefs. 1961-06 725.8 KB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-07 494.2 KB

Perkins, WY 1

1955	CTC and cab signaling on Union Pacific 789.5 KB

permissive signals 3

1950	Differentiation Between Signals 1.1 MB
1950	Differentiation Between Signals 955.8 KB
1941	Non-Stop Permissive Signals 2.8 MB

Perritt, KY 1

1962	News briefs. 1962-07 494.2 KB

Perry, IA 1

1964	Milwaukee installs its first microwave 277.4 KB

Perry, TN 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Perryville, MD 3

1937	New Signaling on Pennsylvania 1.0 MB
1937	Pennsylvania CTC Installation 7.0 MB
1938	Pennsylvania Electrification Signaling 5.3 MB

Pershing, IN 1

1956	Double to Single Track With CTC 7.4 MB

Persia, IA 1

1964	Milwaukee installs its first microwave 277.4 KB

personal 24

1949	A. A. Freiberger 827.1 KB
1949	A. H. Rudd obituary 947.2 KB
1937	A. H. Rudd Retires 1.6 MB
1928	Changes on the C&NW 978.4 KB
1937	Changes on the Pennsylvania 1.6 MB
1946	G. H Dryden retires 455.7 KB
1943	Herbert S. Balliet obituary 614.8 KB
1937	J. C. Mock Retires 1.4 MB
1953	News 2.2 MB
1928	Obituary: Frank P. Patenall 627.0 KB
1940	Obituary: Leroy Wyant 1.0 MB
1941	P. M. Gault obituary 1.2 MB
1928	Personal Mention: G. H. Dryden 432.7 KB
1937	Personal Mention: L. B. Porter 1.5 MB
1937	Personal: C&NW 1.3 MB
1940	Personal: Changes on the New York Central 2.2 MB
1950	Personnel changes on the IC 1.4 MB
1953	Stanley E. Noble Retires 703.8 KB
1936	T. George Stiles Rounds Out 60 Years of Signaling 2.5 MB
1931	Thomas A. Edison (obituary) 1.1 MB
1946	W. M. Post retires 932.3 KB
1925	W. M. Post: News of the Month (July 1925) 775.5 KB
1930	W. M. Vandersluis 550.2 KB
1945	William H. Claus (promotion) 425.7 KB

Perth Amboy, NJ 1

1962	News briefs. 1962-10 461.7 KB

Peru, IL 1

1934	Automatic Interlocking in Train Control Territory 1.5 MB

Peru, IN 5

1931	Centralized Traffic Control Installed on Wabash 5.6 MB
1953	CTC Replaces Manual Block On Single Track 9.0 MB
1958	News briefs. 1958-01 1.8 MB
1963	News briefs. 1963-05 720.2 KB
1965	News briefs. 1965-01 2.0 MB

Petersburg, VA 1

1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB

Petoskey, MI 1

1922	News of the Month. 1922-03 314.9 KB

phankill unit 1

1937	New Devices- March 1937 18.1 MB

phantom indications 4

1936	Phantom Indications 1.8 MB
1939	Phantom Indications in Color-Light Signals 2.2 MB
1937	Phantom Indications of Dwarfs 1.3 MB
1946	The User of Signaling 895.2 KB

Philadelphia & Erie 2

1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1916	William Robinson, Inventor of the Track Circuit 373.1 KB

Philadelphia & Reading 13

1922	Automatic Train Control in Use On American Railroads 353.7 KB
1920	Electro-Mechanical Interlocker at Sunbury, PA 538.5 KB
1917	Flash Lights on the P&R 915.6 KB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1915	Jersey City Terminal Interlocking 1.1 MB
1922	News of the Month. 1922-02 323.2 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. 1922-10 368.4 KB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1922	The Bryn Athyn Collision on the P&R 690.9 KB
1936	Wilmer W. Salmon, President of General Railway Signal Company, Dies 2.8 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Philadelphia Elevated 2

1922	News of the Month. 1922-07 346.9 KB
1922	News of the Month. 1922-08 394.0 KB

Philadelphia Rapid Transit 3

1936	Accuracy of Timing Relays 2.2 MB
1935	Automatic Interlocking on the Philadelphia Elevated 6.1 MB
1937	Delaware River Bridge Signaling 13.9 MB

Philadelphia Suburban Transportation 1

1945	A Most Complicated Automatic Interlocking 2.6 MB

Philadelphia Transportation 4

1960	News briefs. 1960-09 756.9 KB
1960	Railroads fit automation 186.8 KB
1960	Signal construction steady in 1959 385.2 KB
1960	Subway trains route themselves 1.2 MB

Philadelphia, PA 25

1945	A Most Complicated Automatic Interlocking 2.6 MB
1935	Automatic Interlocking on the Philadelphia Elevated 6.1 MB
1915	Beam-Light Signals on the Pennsylvania 318.8 KB
1937	Delaware River Bridge Signaling 13.9 MB
1915	First Position Light Signal Installation 580.6 KB
1944	Light-Type Signals Installed on the Reading 6.3 MB
1964	News briefs. 1964-08 811.5 KB
1922	News of the Month. 1922-02 323.2 KB
1915	North Philadelphia Interlocking 828.9 KB
1931	Pennsylvania Cuts Over Large Interlocking Plant Without Delaying Traffic 2.6 MB
1938	Pennsylvania Electrification Signaling 5.3 MB
1952	Pennsylvania Railroad Installs Large Modern Interlocking at Passenger Station in Philadelphia 1.6 MB
1923	Quick Restoration of Wire Service at Broad Street Station 3.5 MB
1961	Railroad Will Pay For CTC Out Of Accrued Savings 842.9 KB
1931	Re-Signaling of the Reading Electrified Territory 778.0 KB
1946	Reverse Running on the Pennsylvania 2.8 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1916	Service Record of Position-Light Signals 580.8 KB
1931	Signaling for Electrified Operation 3.5 MB
1939	Signaling for the Army-Navy Game 1.0 MB
1933	Signaling on the Pennsylvania's Electrified Line 3.6 MB
1931	Signaling the Philadelphia Terminal of the Pennsylvania 8.9 MB
1916	Some Examples of Early Signaling 351.5 KB
1937	Spring Switch at Branch Line Terminus 5.0 MB
1960	Subway trains route themselves 1.2 MB

Philbrook, MN 1

1964	News briefs. 1964-07 833.0 KB

Phillipsburg, NJ 4

1946	Carryphone on the Pennsylvania 1.5 MB
1922	New Interlocking on the CRR of NJ 734.1 KB
1963	News briefs. 1963-01 951.3 KB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Philo, IL 1

1941	Automatics Installed on the Wabash 4.0 MB

Phinney, R. M. 4

1928	Changes on the C&NW 978.4 KB
1925	Color-Light Signals on C&NW 6.9 MB
1917	New C&NW Bascule Bridge Interlocking 761.1 KB
1917	New Interlocking Plant in Milwaukee 1.2 MB

Phoebe, VA 3

1941	CTC Installed on Norfolk & Western 5.1 MB
1960	News briefs. 1960-05 1.0 MB
1922	News of the Month. 1922-08 394.0 KB

Phoenixville, PA 1

1962	News briefs. 1962-02 1.4 MB

photography 2

1956	Photography 1.5 MB
1917	The Use of Photography in Signaling 432.5 KB

Picacho, AZ 1

1954	SP Modernizes Automatic Block 2.0 MB

Piedmont, MT 1

1916	Signaling the Milwaukee's Electric Zone 624.8 KB

Pierce Jct., TX 1

1954	CTC Improves Train Operation 3.3 MB

Pike, Reading, PA 1

1955	The Reading has compact control machine for consolidated interlocking 511.5 KB

Pilgrim, MA 1

1958	Remote control saves money 868.5 KB

Pine Bluff, AR 4

1946	CTC on 121 Miles of the Cotton Belt 6.4 MB
1959	Signaling moderate during '58 528.6 KB
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

Pine Bluff, MO 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Pine Jct., IN 5

1961	News briefs. 1961-07 648.9 KB
1962	News briefs. 1962-02 1.4 MB
1963	News briefs. 1963-03 790.6 KB
1963	News briefs. 1963-04 896.6 KB
1965	News briefs. 1965-01 2.0 MB

Pine, IN 1

1965	News briefs. 1965-08 749.4 KB

Pineo, CO 1

1947	Burlington Concentrates CTC Control at Division Headquarters 840.8 KB

Pineville, NC 1

1935	Crossing Signals on the Southern 1.4 MB

Pinola, IN 1

1965	News briefs. 1965-08 749.4 KB

Pipas, George 3

1965	Midwest RRs fight the weather 914.4 KB
1953	News 2.2 MB
1964	News briefs. 1964-06 812.0 KB

Piqua, OH 1

1954	CTC Moves Heavy Trains 4.1 MB

Pitkin Avenue Yard, New York, NY 1

1949	Signaling and Interlocking On New Line of New York Subways 6.5 MB

Pittsburg, KS 1

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

Pittsburgh & Lake Erie 20

1922	Automatic Train Control in Use On American Railroads 353.7 KB
1935	Centralized Traffic Control Installed on the Pittsburgh & Lake Erie 12.9 MB
1959	Communications is everywhere at P&LE's Gateway Yard in Youngstown, Ohio 2.1 MB
1955	CTC enables P&LE to remove fourth main track 515.3 KB
1936	Flood Damage to Signaling 5.0 MB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1963	Interlocking: New Solid State Devices Save Money 2.1 MB
1957	More automation for signaling in 1957 1.2 MB
1923	News of the Month. 1923-11 1.8 MB
1959	P&LE installs multiple track CTC 1.1 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1936	Railroads Clean Up After Flood Waters 33.3 MB
1960	Signal construction steady in 1959 385.2 KB
1959	Signaling moderate during '58 528.6 KB
1944	Signaling Modernized On the Pittsburgh & Lake Erie 4.7 MB
1963	Special Report: P&LE Signaling and Communications 3.9 MB
1961	Survey Tells How Railroads Use Hotbox Detectors 1.8 MB
1925	The Train Control Situation 853.0 KB
1926	Train Control Progress in 1925 3.1 MB

Pittsburgh & West Virginia 1

1951	P&WV Signals Entire Main Line 3.9 MB

Pittsburgh Jct., OH 1

1951	P&WV Signals Entire Main Line 3.9 MB

Pittsburgh, Chartiers & Youghiogheny 1

1955	CTC enables P&LE to remove fourth main track 515.3 KB

Pittsburgh, Cincinnati, Chicago & St. Louis 3

1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1920	Modern Telegraph Office at Indianapolis 3.1 MB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB

Pittsburgh, PA 5

1946	Carryphone on the Pennsylvania 1.5 MB
1957	More automation for signaling in 1957 1.2 MB
1959	P&LE installs multiple track CTC 1.1 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1965	Transit vehicles set for automatic running 182.7 KB

Pittsfield, ME 1

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

Pittston Jct., PA 1

1957	Lehigh Valley combines interlockings 404.0 KB

plain bearings 1

1962	Toronto Railway Conference – Automatic Train Operation 448.4 KB

Plaines, IL 1

1934	Centralized Traffic Control Installed on the Alton 1.7 MB

Plainview, IL 4

1937	Alton Uses Spring Switches on Ends of Double Track 5.0 MB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-04 1.5 MB
1965	News briefs. 1965-10 1.1 MB

Plaster Creek, MI 1

1954	Loudspeakers and Interlocking Improve Yard Operation 4.7 MB

Plattsburgh, NY 3

1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-06 989.1 KB
1963	News briefs. 1963-11 1.4 MB

Plattsmouth, NE 1

1955	CTC on single and double track 406.8 KB

plug connector 1

1939	Plug Connector for "H-2" Searchlight Signals 1.1 MB

plug coupler 1

1940	Plug Couplers for Relays and Signals 1.3 MB

plug-in relays 3

1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1949	New Interlocking in Louisville 5.3 MB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB

Plymouth, MI 3

1958	C&O Has Good Ideas in CTC 2.5 MB
1965	News briefs. 1965-12 609.3 KB
1959	Signaling moderate during '58 528.6 KB

pneumatic interlocking 2

1922	Locking Arrangement for Movable Point Crossing Frogs 527.0 KB
1941	Two New Interlockings on the C&WI 5.1 MB

Pneumatic Railway Signal 1

1954	General Railway Signal Company Enters Fiftieth Year 1.6 MB

Pneumatic Signal 1

1936	Wilmer W. Salmon, President of General Railway Signal Company, Dies 2.8 MB

Pocatello, ID 3

1947	ICC Holds Signal Hearing 507.5 KB
1955	News briefs. 1955-08 830.4 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Poe, VA 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

poem 1

1927	The Color Position Light Signal (poem) 435.2 KB

Point of Rocks, MD 1

1959	News briefs. 1959-05 506.5 KB

Point St. Charles, Quebec 1

1915	Victoria Jubilee Bridge Protection 570.0 KB

Pokegama, WI 1

1961	News briefs. 1961-10 1.0 MB

polarity-responsive relays 1

1947	Magnetic-Stick Relays 1.0 MB

polarized line circuits 1

1947	Biased Neutral Relays 461.4 KB

polarized track circuits 2

1936	Railroads Clean Up After Flood Waters 33.3 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB

pole line 3

1962	1962 outlook 3.0 MB
1965	Midwest RRs fight the weather 914.4 KB
1954	Quebec, North Shore & Labrador 7.8 MB

pole line damage 1

1922	News of the Month. 1922-06 516.2 KB

pole lines 2

1935	Pole Lines for Automatic Signaling 1.6 MB
1965	What's the Answer? 1965-06 235.3 KB

politics 1

1920	Political Views on the Railroad Problem 635.6 KB

Polk, CA 2

1962	Automatic Dispatching 2.1 MB
1962	News briefs. 1962-11 468.1 KB

Polo, MO 6

1932	All-Relay Interlocking Installed by Rock Island 1.1 MB
1932	CRI&P Extends Centralized Control 2.6 MB
1945	Milwaukee Installs CTC On 51 Miles 6.5 MB
1949	Signaling Adapted to Traffic On the Rock Island 5.2 MB
1931	Signaling the New Kansas City Line of the Rock Island-Milwaukee 6.4 MB
1945	The New Connections at Kansas City For Milwaukee and Rock Island 4.7 MB

Pomona, CA 1

1950	CTC on Sunset Route 3.1 MB

Pomona, IL 1

1948	CTC Big Help to GM&O 1.7 MB

Pompano, FL 1

1964	News briefs. 1964-12 981.5 KB

Ponca City, OK 1

1955	Santa Fe installs CTC on single track 610.2 KB

Pontiac, MI 2

1953	Grand Trunk Installs CTC on 37 Miles of Busy Single Track 3.5 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Poplar Bluff, MO 1

1960	News briefs. 1960-02 995.4 KB

Poplar St., St. Louis, MO 1

1957	Consolidation cuts costs 1.1 MB

Port Arthur, Ontario 1

1955	How CN increased track capacity 516.4 KB

Port Authority of Allegheny County 1

1965	Transit vehicles set for automatic running 182.7 KB

Port Cartier, Quebec 1

1960	News briefs. 1960-11 875.5 KB

Port Costa, CA 1

1922	News of the Month. 1922-09 562.2 KB

Port Hope, Ontario 1

1960	News briefs. 1960-07 845.4 KB

Port Huron, MI 1

1958	One track does work of two 521.4 KB

Port Jervis, NY 2

1964	News briefs. 1964-09 879.4 KB
1965	News briefs. 1965-02 1.9 MB

Port Orange, FL 1

1964	News briefs. 1964-08 811.5 KB

Port Washington, NY 1

1952	Speed Control Installed on the Long Island 1.3 MB

portable radios 1

1962	EJ&E Uses Tone Coding to Get Systems on One RF Channel 562.3 KB

Portage La Prairie, Manitoba 1

1961	News briefs. 1961-02 1.4 MB

Portage la Prairie, Manitoba 1

1965	News briefs. 1965-01 2.0 MB

Portage la Prairie, Manitoba. 1

1963	News briefs. 1963-05 720.2 KB

Portage, IL 1

1942	Automatic Signal Program on the Illinois Central 4.6 MB

Portage, NY 2

1951	Double Track to Single With CTC 197.9 KB
1951	More Signal Construction in 1950 1.0 MB

Portage, WI 2

1934	Milwaukee to Use Cab Signals 699.1 KB
1931	Remote Control for Interlocking Saves $6,000 Annually 328.9 KB

Porter, IN 11

1921	Accident on Porter, Indiana Interlocking Plant 1.1 MB
1958	Central opens Young Yard 2.5 MB
1939	ICC Permits Removal of Derails 1.1 MB
1954	Loudspeakers and Interlocking Improve Yard Operation 4.7 MB
1949	Modern Signaling on a Division 6.6 MB
1932	New Type of Lead-Out 924.4 KB
1958	News briefs. 1958-01 1.8 MB
1962	News briefs. 1962-07 494.2 KB
1922	News of the Month. 1922-03 314.9 KB
1922	News of the Month. 1922-10 368.4 KB
1946	Pere Marquette Installs CTC 3.1 MB

Porter, L. B. 7

1930	Color-light Automatic Block Signals and Automatic Interlocking 2.4 MB
1947	Developments in Signaling 498.7 KB
1922	Economy in Automatic Signal Operation as Effected by Design 376.2 KB
1917	Light Signals On CM&StP 781.9 KB
1921	Non-Interlocking Non-Stop Grade Crossings 1.6 MB
1937	Personal Mention: L. B. Porter 1.5 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Portland Terminal 2

1955	At Portland Terminal, combined interlocking 810.6 KB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Portland Union Station, Portland, ME 1

1955	At Portland Terminal, combined interlocking 810.6 KB

Portland, ME 2

1955	At Portland Terminal, combined interlocking 810.6 KB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Portland, OR 4

1951	More Signal Construction in 1950 1.0 MB
1964	News briefs. 1964-04 1.3 MB
1935	Safety of High Speed Trains 5.2 MB
1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Portola, CA 2

1950	Modern Signaling Systems On Western Pacific 16.1 MB
1961	News briefs. 1961-08 851.8 KB

Portsmouth, OH 8

1960	CTC signals clear automatically 1.1 MB
1960	From the field 945.2 KB
1963	News briefs. 1963-04 896.6 KB
1964	News briefs. 1964-05 1.0 MB
1937	Ohio Flood Damages Signaling 9.7 MB
1931	Power Interlocking Eliminates Delays 488.8 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1964	What CTC Can Do For You 417.8 KB

Portuguese East Africa 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

position color light signal 1

1922	Position Color Light Signal 612.9 KB

position light signals 28

1947	107 Miles of CTC on the N&W 2.3 MB
1921	Aspects of the Position Light Signal 203.5 KB
1958	Automatic classification yard in service on the Burlington at Chicago 2.9 MB
1915	Beam-Light Signals on the Pennsylvania 318.8 KB
1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB
1935	Coded Track Circuit Signaling on the Pennsylvania 9.8 MB
1915	First Position Light Signal Installation 580.6 KB
1959	Hot box detector sets signals 1.2 MB
1936	Improved Position Light Signal 4.3 MB
1935	Multiple Aspect Signaling 3.3 MB
1944	N&W Installs CTC on Shenandoah Valley Line 10.2 MB
1924	New Plant on the Pennsylvania 3.1 MB
1959	News briefs. 1959-05 506.5 KB
1922	News of the Month. 1922-06 516.2 KB
1922	News of the Month. 1922-11 361.5 KB
1922	News of the Month. 1922-12 388.1 KB
1923	News of the Month. 1923-11 1.8 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1955	Pennsylvania installs wayside equipment for cab signaling 745.7 KB
1952	Pennsylvania Railroad Installs Large Modern Interlocking at Passenger Station in Philadelphia 1.6 MB
1931	Power Interlocking Eliminates Delays 488.8 KB
1936	Replacing Semaphores With Position Light Signals On the Norfolk & Western 7.9 MB
1922	Report of Committee X - Signaling Practice 1.4 MB
1935	Respacing Automatics on the Pennsylvania 1.8 MB
1916	Service Record of Position-Light Signals 580.8 KB
1952	Speed Control Installed on the Long Island 1.3 MB
1921	The Development of Position Light Signals 830.7 KB
1960	What's the answer? Dwarf signals 511.5 KB

Post, W. M. 4

1937	Changes on the Pennsylvania 1.6 MB
1915	Trenton Electro-Mechanical Interlocking 1.7 MB
1946	W. M. Post retires 932.3 KB
1925	W. M. Post: News of the Month (July 1925) 775.5 KB

Potomac Yard, Alexandria, VA 6

1960	Gangs do signal maintenance 309.7 KB
1958	How to save time when trains are entering yards 513.6 KB
1960	News briefs. 1960-10 1.8 MB
1960	Signal construction steady in 1959 385.2 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1958	Signaling to cut expenses in '58 411.4 KB

Poughkeepsie, NY 1

1960	News briefs. 1960-07 845.4 KB

power off stick relay 1

1960	What's the answer? AC track circuits 281.9 KB

power signaling 3

1915	British and American Railroad Signaling 3.6 MB
1934	Paddington Power Signaling 1.9 MB
1911	Summary of Recent Progress in Signaling 4.4 MB

power spring switches 1

1944	Remote Control Interlocking on the D&RGW 4.3 MB

power switch machines 4

1959	New GRS switch machines 531.5 KB
1960	New York City Transit to spend $23 million for signals 189.2 KB
1959	Santa Fe CTCs double track line 2.2 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

power switches 14

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB
1937	CTC in Coaling Station Territory 6.6 MB
1958	How to adapt CTC to your traffic 748.3 KB
1958	Nine layouts in one interlocking 1.7 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1935	Remote Control on the Seaboard 5.4 MB
1958	Remote control saves money 868.5 KB
1963	S&C Role Is Basic To Bison Yard 3.0 MB
1933	Signaling Construction During 1932 632.3 KB
1937	Track Layout for CTC 1.2 MB
1957	Two interlockings save time and money 547.8 KB
1937	What is in Store for the Signal Field? 1.8 MB
1936	What Is the Capacity of a Single-Track Line? 2.0 MB
1957	Why Cotton Belt installed CTC on entire main line 914.0 KB

power transfer relays 2

1935	An Under-Voltage Relay 1.2 MB
1935	Power Transfer Relay 1.3 MB

power-off indications 1

1935	Power-Off Lights at CTC Machines 2.1 MB

Powhatan, WV 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Pratt, KS 1

1947	ICC Signal Hearings 179.7 KB

Preble, TX 1

1955	News briefs. 1955-08 830.4 KB

Prescott, WI 1

1951	More Signal Construction in 1950 1.0 MB

presence detectors 1

1964	News briefs. 1964-05 1.0 MB

Prichard, WV 1

1937	CTC in Coaling Station Territory 6.6 MB

primary batteries 1

1911	Automatic Signals on the Chicago Great Western 7.4 MB

primary battery cell 1

1935	New Devices 1.5 MB

Princeton, IN 1

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

Princeton, WV 3

1960	News briefs. 1960-05 1.0 MB
1960	News briefs. 1960-11 875.5 KB
1963	News briefs. 1963-03 790.6 KB

private line radio 1

1962	EJ&E Uses Tone Coding to Get Systems on One RF Channel 562.3 KB

private radio on single frequency 1

1962	EJ&E Uses Tone Coding to Get Systems on One RF Channel 562.3 KB

Proctor, MN 2

1964	Cars identified automatically 512.0 KB
1954	New Interlocking on Leads to Docks Saves Time for Ore Trains 2.9 MB

Promenade Street, Providence, RI 1

1913	New Haven Concrete Interlocking Towers 2.3 MB

promotion 2

1949	A. A. Freiberger 827.1 KB
1950	Personal: T. B. Thompson 1.1 MB

Prosser, WA 1

1946	Accident on Siding Results in ICC Recommendation for Locks 871.3 KB

Providence, RI 3

1944	New All-Relay Interlocking at Providence, RI on the New Haven 5.8 MB
1947	The New Haven Installs All-Relay Interlocking at Providence, RI 1.9 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Proviso, IL 3

1930	Car Retarders Installed by C&NW at Proviso Yard, near Chicago 3.7 MB
1959	Chicago & North Western Has Unique Hump Cab Signal Controls 2.2 MB
1958	Crossing protection program saves 59% 553.4 KB

Provo, UT 3

1949	An Unusual Automatic Plant 4.5 MB
1937	CTC On the Denver & Rio Grande Western 8.0 MB
1922	News of the Month. 1922-06 516.2 KB

proximity detector 1

1947	Proximity Detector System 905.9 KB

Prussian Street Railway 1

1909	Color Sense and Railway Signal Lights 1.7 MB

Pryse, KY 1

1962	News briefs. 1962-07 494.2 KB

Public Service Railway 1

1916	Signaling a New Street Car Terminal 437.5 KB

Public Works Administration 2

1935	Standardization of Circuit Plans for Highway Crossing Signals 4.5 MB
1935	Wig Wags Approved for PWA Projects 1.4 MB

publicity 1

1933	Signal Publicity 666.2 KB

Pueblo, CO 3

1951	More Signal Construction in 1950 1.0 MB
1960	News briefs. 1960-03 1.9 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Pulaski, VA 2

1950	Neon Lighting For Crossing Gate Arms 3.1 MB
1943	Norfolk & Western Installs CTC on 14 Miles of Single Track 4.4 MB

Pullman 1

1939	Interconnection of Train Signals and Crossing Protection 1.1 MB

Punxsutawney, PA 1

1962	News briefs. 1962-02 1.4 MB

Purcell, OK 1

1955	Santa Fe installs CTC on single track 610.2 KB

purchasing 1

1928	Getting What You Specify 866.4 KB

purple 4

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

Pymatuning, PA 1

1942	Centralized Traffic Control on the Erie 464.3 KB

Railway Signaling: P