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 index 3.8 MB |
Illinois Central Application Denied 854.7 KB |
Contact Pitting 1.6 MB |
Mission Tower Interlocking at Los Angeles 9.2 MB |
New Interlocking at Los Angeles 9.6 MB |
Operation by Signal Indication on Single Track 846.7 KB |
Testing Automatic Signal Controls 950.8 KB |
Track Relay Release Time 1.6 MB |
Special Aspects for Detectors 937.0 KB |
Drag Detectors Protect Bridges 3.2 MB |
Special Aspects for Detectors 937.0 KB |
Special Aspects for Detectors 937.0 KB |
An Improved Flasher Relay 1.8 MB |
An Improved Flasher Relay 1.8 MB |
Improved Searchlight Signal 3.3 MB |
Special Aspects for Detectors 937.0 KB |
1939 index 3.8 MB |
Unusual Signal Trouble 891.9 KB |
Unusual Signal Trouble 1.6 MB |
Illinois Central Application Denied 854.7 KB |
Illinois Central Application Denied 854.7 KB |
Drag Detectors Protect Bridges 3.2 MB |
Operation by Signal Indication on Single Track 846.7 KB |
Special Aspects for Detectors 937.0 KB |
Speeding Up Train Operation With Signaling 4.5 MB |
Unusual Signal Trouble 1.6 MB |
Contact Pitting 1.6 MB |
Action at Approach Signal 964.5 KB |
The Signaling Regulations 907.9 KB |
A Signal Shopping Policy 965.3 KB |
A Signal Shopping Policy 965.3 KB |
Unusual Signal Trouble 835.4 KB |
Unusual Signal Trouble 835.4 KB |
The Problem of Medium Speed 835.3 KB |
Milwaukee Utilizes Teletype 1.6 MB |
Testing Sets 2.0 MB |
DC Time Element Relay 1.9 MB |
Track Relay Release Time 1.6 MB |
Light Signals as Train-Order Signals 918.5 KB |
Mission Tower Interlocking at Los Angeles 9.2 MB |
New Interlocking at Los Angeles 9.6 MB |
Unusual Signal Trouble 835.4 KB |
Testing Sets 2.0 MB |