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.
B&O Installs All-Relay Plant 2.6 MB |
Differentiation Between Signals 1.1 MB |
Differentiation Between Signals 955.8 KB |
CTC on Sunset Route 3.1 MB |
B&O Installs All-Relay Plant 2.6 MB |
Approach Distances and Times 5.5 MB |
Approach Distances and Times 5.5 MB |
Retained-Neutral Neutral Relay 3.4 MB |
Unusual Trouble 3.0 MB |
CTC on Sunset Route 3.1 MB |
Signaling and Rules 1.4 MB |
Obituary: B. J. Schwendt 961.7 KB |
B&O Installs All-Relay Plant 2.6 MB |
B&O Installs All-Relay Plant 2.6 MB |
Lunar White 419.3 KB |
NYC Installs Big NX Plant at Fostoria, Ohio 3.9 MB |
B&O Installs All-Relay Plant 2.6 MB |
L&N Extends CTC on "EK" 10.4 MB |
CTC on the Wabash 2.6 MB |
Bootleg Risers and Bonds 2.1 MB |
Flashing Signal Aspects 1.1 MB |
Gate-Arm Stripe Colors 3.4 MB |
Two Single Tracks, Side By Side 1.4 MB |
Stopping Distance on Grades 3.5 MB |
Personnel changes on the IC 1.4 MB |
CTC on the Wabash 2.6 MB |
DC Track Circuit Trouble 1.6 MB |
Increasing Use of Carrier 1.3 MB |
Differentiation Between Signals 955.8 KB |
Grade Signal Controls 2.1 MB |
Spring Switch Signaling 2.5 MB |
OSing Device 1.4 MB |
Gate-Arm Stripe Colors 3.4 MB |
Lunar White 419.3 KB |
Differentiation Between Signals 955.8 KB |
Special Interlocking Controls 2.2 MB |
Unusual Trouble 3.0 MB |
Increasing Use of Carrier 1.3 MB |
Microwaves on Railroads 1.3 MB |
CTC Code Lines 1.1 MB |
L&N Extends CTC on "EK" 10.4 MB |
New Developments 16.9 MB |
New Developments 16.9 MB |
B&O Installs All-Relay Plant 2.6 MB |
CTC on Sunset Route 3.1 MB |
Unusual Trouble 3.0 MB |
New Developments 16.9 MB |
CTC on the Reading 6.6 MB |
Approach Distances and Times 5.5 MB |
Grade Signal Controls 2.1 MB |
Signals for Trains at Highway Crossings 5.9 MB |
Flood Detectors on the Katy 2.7 MB |
CTC on the Wabash 2.6 MB |
Grade Signal Controls 2.1 MB |
Gate-Arm Stripe Colors 1.1 MB |
Gate-Arm Stripe Colors 3.4 MB |
B&O Installs All-Relay Plant 2.6 MB |
Big NX Interlocking at Atlanta 6.3 MB |
CTC Extended on the Rio Grande 4.4 MB |
CTC on the Reading 6.6 MB |
Double to Single Track with Remote Control 4.2 MB |
CTC on the Wabash 2.6 MB |
Grade Signal Controls 2.1 MB |
Gate-Arm Stripe Colors 3.4 MB |
OSing Device 1.4 MB |
High Speed Turnout Signaling 2.3 MB |
Interlocking Plant Horns 1.2 MB |
Interlocking Plant Horns 2.3 MB |
New Developments 16.9 MB |
Flashing Signal Aspects 1.1 MB |
IC Rebuilds Classification Yard 6.9 MB |
Personal: T. B. Thompson 1.1 MB |
Personnel changes on the IC 1.4 MB |
CTC Indication Code 1.2 MB |
CTC on Sunset Route 3.1 MB |
Instrument Case Platforms 3.7 MB |
Approach Distances and Times 5.5 MB |
B&O Installs All-Relay Plant 2.6 MB |
Big NX Interlocking at Atlanta 6.3 MB |
Consolidated Control of Interlockings 1.3 MB |
Consolidation of Interlockings 2.5 MB |
CTC on the Reading 6.6 MB |
Interlocking Plant Horns 1.2 MB |
Interlocking Plant Horns 2.3 MB |
L&N Extends CTC on "EK" 10.4 MB |
NYC Installs Big NX Plant at Fostoria, Ohio 3.9 MB |
Passenger Terminal Signals 993.8 KB |
Special Interlocking Controls 2.2 MB |
SS Protection 2.1 MB |
Gate-Arm Stripe Colors 3.4 MB |
CTC on the Reading 6.6 MB |
Increasing Use of Carrier 1.3 MB |
Microwaves on Railroads 1.3 MB |
Bootleg Risers and Bonds 2.1 MB |
Gate-Arm Stripe Colors 3.4 MB |
L&N Extends CTC on "EK" 10.4 MB |
Lunar White 419.3 KB |
Spring Switch Signaling 2.5 MB |
CTC on the Reading 6.6 MB |
OSing Device 1.4 MB |
SS Protection 2.1 MB |
Microwaves on Railroads 1.3 MB |
Bootleg Risers and Bonds 2.1 MB |
Spring Switch Signaling 2.5 MB |
Stopping Distance on Grades 3.5 MB |
Two Single Tracks, Side By Side 1.4 MB |
Unusual Trouble 3.0 MB |
Flood Detectors on the Katy 2.7 MB |
Differentiation Between Signals 955.8 KB |
CTC on the Wabash 2.6 MB |
Instrument Case Platforms 3.7 MB |
New Developments 16.9 MB |
CTC on the Wabash 2.6 MB |
Differentiation Between Signals 1.1 MB |
Gate-Arm Stripe Colors 3.4 MB |
Instrument Case Platforms 3.7 MB |
NYC Installs Big NX Plant at Fostoria, Ohio 3.9 MB |
Obituary: B. J. Schwendt 961.7 KB |
Temporary Change of Signal Controls 2.2 MB |
Approach Distances and Times 5.5 MB |
Stopping Distance on Grades 3.5 MB |
Neon Lighting For Crossing Gate Arms 3.1 MB |
Unusual Signals 1.1 MB |
Interlocking Plant Horns 2.3 MB |
Obituary: B. J. Schwendt 961.7 KB |
New Rail-Web Bond 1.3 MB |
Signaling and Rules 1.4 MB |
OSing Device 1.4 MB |
Passenger Terminal Signals 993.8 KB |
OSing Device 1.4 MB |
Passenger Terminal Signals 993.8 KB |
CTC on the Wabash 2.6 MB |
Differentiation Between Signals 1.1 MB |
Differentiation Between Signals 955.8 KB |
Personnel changes on the IC 1.4 MB |
CTC on Sunset Route 3.1 MB |
Increasing Use of Carrier 1.3 MB |
New Rail-Web Bond 1.3 MB |
L&N Extends CTC on "EK" 10.4 MB |
CTC on the Reading 6.6 MB |
Passenger Terminal Signals 993.8 KB |
New Developments 16.9 MB |
Signaling and Rules 1.4 MB |
Big NX Interlocking at Atlanta 6.3 MB |
CTC Indication Code 1.2 MB |
CTC on the Reading 6.6 MB |
High Speed Turnout Signaling 2.3 MB |
Lunar White 419.3 KB |
Signaling and Rules 1.4 MB |
Signaling and Rules 1.4 MB |
Spring Switch Signaling 2.5 MB |
CTC on Sunset Route 3.1 MB |
Interlocking Plant Horns 2.3 MB |
New Developments 16.9 MB |
CTC on the Wabash 2.6 MB |
SS Protection 2.1 MB |
CTC on the Wabash 2.6 MB |
New Developments 16.9 MB |
New Developments 16.9 MB |
Personal: T. B. Thompson 1.1 MB |
Telephones at Signals 1.1 MB |
DC Track Circuit Trouble 1.6 MB |
Approach Distances and Times 5.5 MB |
Approach Distances and Times 5.5 MB |
New Developments 16.9 MB |
DC Track Circuit Trouble 1.6 MB |
CTC on the Reading 6.6 MB |
Two Single Tracks, Side By Side 1.4 MB |
Illuminated Train Order Fork 1.1 MB |
Flashing Signal Aspects 1.1 MB |
Illuminated Train Order Fork 1.1 MB |
New Developments 16.9 MB |
Bootleg Risers and Bonds 2.1 MB |
Personnel changes on the IC 1.4 MB |
Continuity of Train Communication 2.6 MB |
CTC Installed on 128 Miles of NKP 12.1 MB |
CTC on Sunset Route 3.1 MB |
Microwaves on Railroads 1.3 MB |
Retained-Neutral Neutral Relay 3.4 MB |
Route Type Interlocking on New York Subway 8.7 MB |
SS Protection 2.1 MB |
Unusual Signals 1.1 MB |
Differentiation Between Signals 955.8 KB |
Bootleg Risers and Bonds 2.1 MB |
Increasing Use of Carrier 1.3 MB |
Flood Detectors on the Katy 2.7 MB |