Pacific Electric 2
Pacific Jct., IL 1
Paducah & Illinois 1
Paducah, KY 2
Page Ave., St. Louis, MO 1
Palmer Lake, CO 1
Pana, IL 1
Panama 1
Paoli, PA 2
Paris, France 1
Park Jct., PA 1
Parkersburg, WV 4
Parkesburg, PA 1
Parkway, IL 1
Parsons Yard, OH 1
passenger reservations 1
passenger terminals 1
1950 Passenger Terminal Signals 993.8 KB
passing sidings 1
1940 "Running" Passing Tracks 1.1 MB
Patenall, F. P. 5
Pauls Valley, OK 1
Pavonia, NJ 1
Peach Creek, WV 1
Peerless Manufacturing 1
Pekin, IL 3
Pelham Bay Line, New York, NY 1
pendulum type code transmitters 1
Penn, Philadelphia, PA 2
Pennock, MN 1
Pennsylvania 153
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
1937 Approach Indications to Train Order Signals 4.2 MB
1929 Are Automatic Signals on Sidings Justified? 1.6 MB
1936 Bad Collisions on Best Railroads 2.5 MB
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
1931 Circuit for Signal Demonstration 490.2 KB
1935 Coded Track Circuit Signaling on the Pennsylvania 9.8 MB
1956 Conelrad – A Civil Defense Measure … How Some Railroads are Participating 4.1 MB
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
1952 CTC Machine Hangs High But Trains Run 704.9 KB
1927 Derail Failure Results in Collision on Crossing 995.6 KB
1931 Derails in Passing Sidings 1.1 MB
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
1920 Electro-Mechanical Interlocker at Sunbury, PA 538.5 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
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
1946 ICC 50-MPH Signal Hearing 6.9 MB
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
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
1949 Main Line Crossovers 2.4 MB
1938 Milwaukee Rehabilitates Large Plant 8.0 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
1930 New Interlocking on Pennsylvania at Harrisburg Replaces Three Old Plants 2.3 MB
1937 New Signaling on Pennsylvania 1.0 MB
1923 News of the Month (October 1923) 1.9 MB
1941 Non-Stop Permissive Signals 2.8 MB
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
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
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
1923 Quick Restoration of Wire Service at Broad Street Station 3.5 MB
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
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
1946 Reverse Running on the Pennsylvania 2.8 MB
1937 Rule for Crossing Protection 1.2 MB
1935 Safety of High Speed Trains 5.2 MB
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
1935 Signal Night for New York Railroad Club 1.1 MB
1933 Signal Publicity 666.2 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
1937 Signals in Advance of Switches 1.1 MB
1936 Slide Detector Fences 4.3 MB
1936 Slide Detector Signals 12.9 MB
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
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 845.0 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
1944 Train Telephone Communication 4.1 MB
1923 Train-Order Signals at Interlockers 3.6 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
1929 Where Should Grade Signals Be Installed? 1.2 MB
Pennsylvania Central 1
1922 The Red Light 624.5 KB
Pennsylvania Station, New York, NY 2
Pennsylvania-Reading Seashore Lines 1
1950 Passenger Terminal Signals 993.8 KB
Peoria & Pekin Union 5
Peoria, IL 3
Peosta, IA 1
Pequot, IL 2
Pere Marquette 22
Pergo, OH 1
1950 CTC on the Wabash 2.6 MB
permissive signals 3
Perryville, MD 3
Pershing, IN 1
personal 24
1949 A. A. Freiberger 822.2 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 609.4 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
Peru, IL 1
Peru, IN 2
Petersburg, VA 1
phankill unit 1
1937 New Devices- March 1937 18.1 MB
phantom indications 4
Philadelphia & Reading 2
Philadelphia Rapid Transit 3
Philadelphia, PA 14
Phillipsburg, NJ 1
Philo, IL 1
Phinney, R. M. 4
Phoebe, VA 1
photography 1
1956 Photography 1.5 MB
Pine Bluff, AR 1
Pineville, NC 1
Pipas, George 1
1953 News 2.2 MB
Pitkin Avenue Yard, New York, NY 1
Pittsburgh & Lake Erie 7
Pittsburgh, Cincinnati, Chicago & St. Louis 1
Pittsburgh, PA 1
Plaines, IL 1
Plainview, IL 1
plug connector 1
plug coupler 1
plug-in relays 1
pneumatic interlocking 1
Pneumatic Signal 1
poem 1
polarized track circuits 1
pole lines 1
politics 1
Polo, MO 6
Pomona, CA 1
1950 CTC on Sunset Route 3.1 MB
Port Washington, NY 1
Portage, IL 1
Portage, WI 1
1934 Milwaukee to Use Cab Signals 699.1 KB
Porter, IN 5
Porter, L. B. 4
Portland, OR 1
1935 Safety of High Speed Trains 5.2 MB
Portola, CA 1
Portsmouth, OH 1
position color light signal 1
1922 Position Color Light Signal 612.9 KB
position light signals 12
Post, W. M. 3
power signaling 2
power spring switches 1
power switches 5
power transfer relays 2
1935 An Under-Voltage Relay 1.2 MB
1935 Power Transfer Relay 1.3 MB
power-off indications 1
Prichard, WV 1
primary batteries 1
primary battery cell 1
1935 New Devices 1.5 MB
Promenade Street, Providence, RI 1
promotion 1
1949 A. A. Freiberger 822.2 KB
Prosser, WA 1
Providence, RI 1
Proviso, IL 1
Provo, UT 2
Prussian Street Railway 1
PSTC Philadelphia Suburban 1
Public Works Administration 2
publicity 1
1933 Signal Publicity 666.2 KB
Pulaski, VA 2
Pullman 1
purchasing 1
1928 Getting What You Specify 866.4 KB
purple 1
purple lenses 3
1935 Multiple Aspect Signaling 3.3 MB
1935 Purple Signal Glasses 3.6 MB
1935 Purple Signal Glasses 3.3 MB
Pymatuning, PA 1

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