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.
1939 1
1939 index
3.8 MB
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absolute permissive block signaling 3
Albert Lea, MN 1
Alton 1
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Illinois Central Application Denied
854.7 KB
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Amqui, TN 1
Ashkum, IL 1
Atchison, Topeka & Santa Fe 6
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Contact Pitting
1.6 MB
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Mission Tower Interlocking at Los Angeles
9.2 MB
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New Interlocking at Los Angeles
9.6 MB
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Operation by Signal Indication on Single Track
846.7 KB
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Testing Automatic Signal Controls
950.8 KB
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Track Relay Release Time
1.6 MB
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automatic block signaling 11
automatic interlocking 2
automatic train control 4
automatic train stop 1
braking distance 1
bridge alignment detectors 1
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Special Aspects for Detectors
937.0 KB
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Bridgeport, CT 1
cab signaling 4
Canadian Pacific 1
centralized traffic control 5
Chicago, Burlington & Quincy 4
Chicago, IL 1
Chicago, Milwaukee, St. Paul & Pacific 4
Chicago, Rock Island & Pacific 3
circuit design 1
Cleveland, Cincinnati, Chicago & St. Louis 1
College Park, San Jose, CA 1
color light signals 1
Colorado & Southern 1
derails 1
Detroit, MI 1
dragging equipment detectors 2
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Drag Detectors Protect Bridges
3.2 MB
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Special Aspects for Detectors
937.0 KB
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drawbridge 1
drawbridges 1
electric interlocking 1
electric lighting 2
Erie 1
fire detectors 1
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Special Aspects for Detectors
937.0 KB
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flasher relay 1
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An Improved Flasher Relay
1.8 MB
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FN-16 flasher relay 1
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An Improved Flasher Relay
1.8 MB
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four-indication signaling 1
Gasconade, MO 1
Gault, P. M. 1
General Railway Signal 3
Grand Trunk Western 1
H-2 searchlight signals 1
H-5 searchlight signals 1
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Improved Searchlight Signal
3.3 MB
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Henderson, KY 1
high water detectors 1
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Special Aspects for Detectors
937.0 KB
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highway crossings 6
Hull, England 1
Illinois Central 4
index 1
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1939 index
3.8 MB
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Indiana Harbor Belt 1
insulated joints 2
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Unusual Signal Trouble
891.9 KB
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Unusual Signal Trouble
1.6 MB
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interlocking 16
Interstate Commerce Commission 5
Interurban Electric 3
Jefferson City, MO 1
Key System 3
London & North Eastern 1
Long Island 1
Los Angeles Union Passenger Terminal 2
Los Angeles, CA 2
Louisville & Nashville 2
manual block signaling 1
Manufacturers Railway 1
Mason City, IL 1
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Illinois Central Application Denied
854.7 KB
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mechanical interlocking 1
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Illinois Central Application Denied
854.7 KB
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Melbourne, Australia 1
Michigan Central 3
Minneapolis & St. Louis 1
Mission Tower, Los Angeles, CA 1
Missouri Pacific 5
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Drag Detectors Protect Bridges
3.2 MB
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Operation by Signal Indication on Single Track
846.7 KB
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Special Aspects for Detectors
937.0 KB
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Speeding Up Train Operation With Signaling
4.5 MB
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Unusual Signal Trouble
1.6 MB
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motor cars 1
New York Central 4
New York, New Haven & Hartford 1
New York, NY 1
NX interlocking 1
Oakland, CA 3
Osage, MO 1
Osceola, IA 1
Ottawa, IL 2
Ottumwa, IA 1
Pennsylvania 2
phantom indications 1
Philadelphia, PA 1
plug connector 1
Porter, IN 1
Pullman 1
rail bonding 1
relay interlocking 1
relays 1
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Contact Pitting
1.6 MB
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rock slide fences 2
Rules, Standards and Instructions 1
Rutherford Jct., NJ 1
Sacramento Northern 3
San Francisco, CA 3
San Francisco-Oakland Bay Bridge 3
San Jose, CA 1
searchlight signals 3
semaphore signals 3
signal aspects 6
signal indications 1
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Action at Approach Signal
964.5 KB
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signal inspections 1
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The Signaling Regulations
907.9 KB
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signal repair 1
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A Signal Shopping Policy
965.3 KB
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signal shop 1
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A Signal Shopping Policy
965.3 KB
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signal trouble 1
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Unusual Signal Trouble
835.4 KB
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solar angle 1
soup 1
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Unusual Signal Trouble
835.4 KB
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Southern Pacific 6
spring switches 1
St. Louis, MO 3
Standard Code 1
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The Problem of Medium Speed
835.3 KB
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teletype 1
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Milwaukee Utilizes Teletype
1.6 MB
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Terminal Railroad Association of St. Louis 1
Terminal Tower, Los Angeles, CA 1
test set 1
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Testing Sets
2.0 MB
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time element relays 1
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DC Time Element Relay
1.9 MB
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track circuits 1
track relays 1
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Track Relay Release Time
1.6 MB
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train describer 2
train order signals 1
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Light Signals as Train-Order Signals
918.5 KB
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train orders 1
turnouts 1
Union Pacific 3
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Mission Tower Interlocking at Los Angeles
9.2 MB
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New Interlocking at Los Angeles
9.6 MB
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Unusual Signal Trouble
835.4 KB
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Union Switch & Signal 7
Victorian Government Railways 1
vital circuits 1
Western Pacific 1
Western Railroad Supply 1
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Testing Sets
2.0 MB
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