Railway Signaling: 1939

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.

1939 1

1939	1939 index 3.8 MB

absolute permissive block signaling 3

1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	Electric Lights for Semaphores 1.9 MB
1939	Operation by Signal Indication on Single Track 846.7 KB

Albert Lea, MN 1

1939	CTC and Automatic Signals on the Rock Island 6.6 MB

Alton 1

1939	Illinois Central Application Denied 854.7 KB

Amqui, TN 1

1939	Electric Lights for Semaphores 1.9 MB

Ashkum, IL 1

1939	Automatic Gates on the Illinois Central 3.3 MB

Atchison, Topeka & Santa Fe 6

1939	Contact Pitting 1.6 MB
1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB
1939	Operation by Signal Indication on Single Track 846.7 KB
1939	Testing Automatic Signal Controls 950.8 KB
1939	Track Relay Release Time 1.6 MB

automatic block signaling 11

1939	A Message of Confidence 741.8 KB
1939	Controlling Four-Aspect Automatics 1.6 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	Electric Lights for Semaphores 1.9 MB
1939	Intermediate Signals and Approach Aspects 2.3 MB
1939	Operation by Signal Indication on Single Track 846.7 KB
1939	Problems of Four-Indication Signaling 1.6 MB
1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1939	Testing Automatic Signal Controls 950.8 KB
1939	Track Turnouts and Signal Aspects 1.8 MB

automatic interlocking 2

1939	Automatic Cut-Outs at an Automatic Interlocking 7.6 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB

automatic train control 4

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
1939	Speeding Up Train Operation With Signaling 4.5 MB

automatic train stop 1

1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB

braking distance 1

1939	Intermediate Signals and Approach Aspects 2.3 MB

bridge alignment detectors 1

1939	Special Aspects for Detectors 937.0 KB

Bridgeport, CT 1

1939	Electric Interlocking on the New Haven 2.1 MB

cab signaling 4

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
1939	Speeding Up Train Operation With Signaling 4.5 MB

Canadian Pacific 1

1939	Controlling Four-Aspect Automatics 1.6 MB

centralized traffic control 5

1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	CTC on Multiple Track 1.8 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB
1939	Unusual Signal Trouble 1.6 MB

Chicago, Burlington & Quincy 4

1939	Automatic Cut-Outs at an Automatic Interlocking 7.6 MB
1939	Burlington Replaces Semaphores With Color Lights 3.4 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB
1939	Track Relay Release Time 1.6 MB

Chicago, IL 1

1939	Interconnection of Train Signals and Crossing Protection 1.1 MB

Chicago, Milwaukee, St. Paul & Pacific 4

1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB
1939	Milwaukee Utilizes Teletype 1.6 MB
1939	Unusual Signal Trouble 891.9 KB

Chicago, Rock Island & Pacific 3

1939	Automatic Cut-Outs at an Automatic Interlocking 7.6 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB

circuit design 1

1939	Safety and Design of Signal Circuits 5.0 MB

Cleveland, Cincinnati, Chicago & St. Louis 1

1939	Recording Burning Time of Electric Lights 900.6 KB

College Park, San Jose, CA 1

1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB

color light signals 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

Colorado & Southern 1

1939	Checking Track Circuits From a Motor Car 837.6 KB

derails 1

1939	ICC Permits Removal of Derails 1.1 MB

Detroit, MI 1

1939	Interconnection of Train Signals and Crossing Protection 1.1 MB

dragging equipment detectors 2

1939	Drag Detectors Protect Bridges 3.2 MB
1939	Special Aspects for Detectors 937.0 KB

drawbridge 1

1939	Electric Interlocking on the New Haven 2.1 MB

drawbridges 1

1939	Drag Detectors Protect Bridges 3.2 MB

electric interlocking 1

1939	Erie Installs Electric Interlocking 2.2 MB

electric lighting 2

1939	Electric Lights for Semaphores 1.9 MB
1939	Recording Burning Time of Electric Lights 900.6 KB

Erie 1

1939	Erie Installs Electric Interlocking 2.2 MB

fire detectors 1

1939	Special Aspects for Detectors 937.0 KB

flasher relay 1

1939	An Improved Flasher Relay 1.8 MB

FN-16 flasher relay 1

1939	An Improved Flasher Relay 1.8 MB

four-indication signaling 1

1939	Problems of Four-Indication Signaling 1.6 MB

Gasconade, MO 1

1939	Drag Detectors Protect Bridges 3.2 MB

Gault, P. M. 1

1939	Speeding Up Train Operation With Signaling 4.5 MB

General Railway Signal 3

1939	DC Time Element Relay 1.9 MB
1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	Safety and Design of Signal Circuits 5.0 MB

Grand Trunk Western 1

1939	Today's Crossing Protection Problem 1.8 MB

H-2 searchlight signals 1

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

H-5 searchlight signals 1

1939	Improved Searchlight Signal 3.3 MB

Henderson, KY 1

1939	Electric Lights for Semaphores 1.9 MB

high water detectors 1

1939	Special Aspects for Detectors 937.0 KB

highway crossings 6

1939	Automatic Gates on the Illinois Central 3.3 MB
1939	Contact Pitting 1.6 MB
1939	Crossing Protection for a Town 907.3 KB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1939	Today's Crossing Protection Problem 1.8 MB

Hull, England 1

1939	230 Routes In a Relay Interlocking 2.3 MB

Illinois Central 4

1939	A Message of Confidence 741.8 KB
1939	Automatic Gates on the Illinois Central 3.3 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	Illinois Central Application Denied 854.7 KB

index 1

1939	1939 index 3.8 MB

Indiana Harbor Belt 1

1939	Speeding Up Train Operation With Signaling 4.5 MB

insulated joints 2

1939	Unusual Signal Trouble 891.9 KB
1939	Unusual Signal Trouble 1.6 MB

interlocking 16

1939	230 Routes In a Relay Interlocking 2.3 MB
1939	Automatic Cut-Outs at an Automatic Interlocking 7.6 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	Electric Interlocking on the New Haven 2.1 MB
1939	Erie Installs Electric Interlocking 2.2 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB
1939	ICC Permits Removal of Derails 1.1 MB
1939	Illinois Central Application Denied 854.7 KB
1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB
1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB
1939	Unusual Signal Trouble 835.4 KB

Interstate Commerce Commission 5

1939	Action at Approach Signal 964.5 KB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB
1939	ICC Issues Rules, Standards and Instructions for Signaling 10.3 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1939	The Signaling Regulations 907.9 KB

Interurban Electric 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

Jefferson City, MO 1

1939	Drag Detectors Protect Bridges 3.2 MB

Key System 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

London & North Eastern 1

1939	230 Routes In a Relay Interlocking 2.3 MB

Long Island 1

1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB

Los Angeles Union Passenger Terminal 2

1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB

Los Angeles, CA 2

1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB

Louisville & Nashville 2

1939	Electric Lights for Semaphores 1.9 MB
1939	Operation by Signal Indication on Single Track 846.7 KB

manual block signaling 1

1939	Speeding Up Train Operation With Signaling 4.5 MB

Manufacturers Railway 1

1939	Interconnection of Train Signals and Crossing Protection 1.1 MB

Mason City, IL 1

1939	Illinois Central Application Denied 854.7 KB

mechanical interlocking 1

1939	Illinois Central Application Denied 854.7 KB

Melbourne, Australia 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

Michigan Central 3

1939	Controlling Four-Aspect Automatics 1.6 MB
1939	ICC Permits Removal of Derails 1.1 MB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB

Minneapolis & St. Louis 1

1939	CTC and Automatic Signals on the Rock Island 6.6 MB

Mission Tower, Los Angeles, CA 1

1939	Mission Tower Interlocking at Los Angeles 9.2 MB

Missouri Pacific 5

1939	Drag Detectors Protect Bridges 3.2 MB
1939	Operation by Signal Indication on Single Track 846.7 KB
1939	Special Aspects for Detectors 937.0 KB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1939	Unusual Signal Trouble 1.6 MB

motor cars 1

1939	Checking Track Circuits From a Motor Car 837.6 KB

New York Central 4

1939	CTC on Multiple Track 1.8 MB
1939	ICC Permits Removal of Derails 1.1 MB
1939	Problems of Four-Indication Signaling 1.6 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB

New York, New Haven & Hartford 1

1939	Electric Interlocking on the New Haven 2.1 MB

New York, NY 1

1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB

NX interlocking 1

1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB

Oakland, CA 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

Osage, MO 1

1939	Drag Detectors Protect Bridges 3.2 MB

Osceola, IA 1

1939	Burlington Replaces Semaphores With Color Lights 3.4 MB

Ottawa, IL 2

1939	Automatic Cut-Outs at an Automatic Interlocking 7.6 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB

Ottumwa, IA 1

1939	Burlington Replaces Semaphores With Color Lights 3.4 MB

Pennsylvania 2

1939	Signaling for the Army-Navy Game 1.0 MB
1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB

phantom indications 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

Philadelphia, PA 1

1939	Signaling for the Army-Navy Game 1.0 MB

plug connector 1

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

Porter, IN 1

1939	ICC Permits Removal of Derails 1.1 MB

Pullman 1

1939	Interconnection of Train Signals and Crossing Protection 1.1 MB

rail bonding 1

1939	Recent Developments In Rail Bonding 3.7 MB

relay interlocking 1

1939	230 Routes In a Relay Interlocking 2.3 MB

relays 1

1939	Contact Pitting 1.6 MB

rock slide fences 2

1939	Rock Detector Protection on the Western Pacific 2.1 MB
1939	Special Aspects for Detectors 937.0 KB

Rules, Standards and Instructions 1

1939	ICC Issues Rules, Standards and Instructions for Signaling 10.3 MB

Rutherford Jct., NJ 1

1939	Erie Installs Electric Interlocking 2.2 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

San Francisco, CA 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

San Francisco-Oakland Bay Bridge 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

San Jose, CA 1

1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB

searchlight signals 3

1939	Burlington Replaces Semaphores With Color Lights 3.4 MB
1939	Improved Searchlight Signal 3.3 MB
1939	Plug Connector for "H-2" Searchlight Signals 1.1 MB

semaphore signals 3

1939	A Message of Confidence 741.8 KB
1939	Burlington Replaces Semaphores With Color Lights 3.4 MB
1939	Electric Lights for Semaphores 1.9 MB

signal aspects 6

1939	Cab Signaling and Train Control On the San Francisco-Oakland Bay Bridge 7.2 MB
1939	Intermediate Signals and Approach Aspects 2.3 MB
1939	Problems of Four-Indication Signaling 1.6 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

signal indications 1

1939	Action at Approach Signal 964.5 KB

signal inspections 1

1939	The Signaling Regulations 907.9 KB

signal repair 1

1939	A Signal Shopping Policy 965.3 KB

signal shop 1

1939	A Signal Shopping Policy 965.3 KB

signal trouble 1

1939	Unusual Signal Trouble 835.4 KB

solar angle 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

soup 1

1939	Unusual Signal Trouble 835.4 KB

Southern Pacific 6

1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB
1939	Repairing Spring Switch Mechanisms 1.8 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB
1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB

spring switches 1

1939	Repairing Spring Switch Mechanisms 1.8 MB

St. Louis, MO 3

1939	Drag Detectors Protect Bridges 3.2 MB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB
1939	St. Louis Municipal Bridge Signaling 3.8 MB

Standard Code 1

1939	The Problem of Medium Speed 835.3 KB

teletype 1

1939	Milwaukee Utilizes Teletype 1.6 MB

Terminal Railroad Association of St. Louis 1

1939	St. Louis Municipal Bridge Signaling 3.8 MB

Terminal Tower, Los Angeles, CA 1

1939	New Interlocking at Los Angeles 9.6 MB

test set 1

1939	Testing Sets 2.0 MB

time element relays 1

1939	DC Time Element Relay 1.9 MB

track circuits 1

1939	Checking Track Circuits From a Motor Car 837.6 KB

track relays 1

1939	Track Relay Release Time 1.6 MB

train describer 2

1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB

train order signals 1

1939	Light Signals as Train-Order Signals 918.5 KB

train orders 1

1939	Speeding Up Train Operation With Signaling 4.5 MB

turnouts 1

1939	Track Turnouts and Signal Aspects 1.8 MB

Union Pacific 3

1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB
1939	Unusual Signal Trouble 835.4 KB

Union Switch & Signal 7

1939	An Improved Flasher Relay 1.8 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1939	Improved Searchlight Signal 3.3 MB
1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1939	New Interlocking at Los Angeles 9.6 MB
1939	Plug Connector for "H-2" Searchlight Signals 1.1 MB
1939	Track Relay Release Time 1.8 MB

Victorian Government Railways 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

vital circuits 1

1939	Safety and Design of Signal Circuits 5.0 MB

Western Pacific 1

1939	Rock Detector Protection on the Western Pacific 2.1 MB

Western Railroad Supply 1

1939	Testing Sets 2.0 MB

World's Fair 1939-40 1

1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB

yards 1

1939	Speeding Up Train Operation With Signaling 4.5 MB

Railway Signaling: 1939

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