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.
Consolidation cuts costs 1.1 MB |
Consolidation cuts costs 1.1 MB |
1957 index 2.9 MB |
ICC Reports on NYC wreck 205.5 KB |
Consolidation cuts costs 1.1 MB |
Lehigh Valley combines interlockings 404.0 KB |
More automation for signaling in 1957 1.2 MB |
Two interlockings save time and money 547.8 KB |
Track circuit developments in Europe 234.8 KB |
How long sidings save train time 465.2 KB |
How to make non-stop meet with CTC 576.9 KB |
Two interlockings save time and money 547.8 KB |
What's the Answer: Spring switches? 200.0 KB |
Why Cotton Belt installed CTC on entire main line 914.0 KB |
Track circuit developments in Europe 234.8 KB |
How to make non-stop meet with CTC 576.9 KB |
More automation for signaling in 1957 1.2 MB |
What's the answer: Slotting relay? 361.2 KB |
GN CTC's 175 miles of mainline 635.9 KB |
How to make non-stop meet with CTC 576.9 KB |
Seaway diverts CN mainline 532.3 KB |
Signal controls by track circuit only 575.8 KB |
Why Cotton Belt installed CTC on entire main line 914.0 KB |
Seaway diverts CN mainline 532.3 KB |
How to make non-stop meet with CTC 576.9 KB |
ICC Reports on NYC wreck 205.5 KB |
Lehigh Valley has check-in, check-out 755.3 KB |
Track circuit developments in Europe 234.8 KB |
How long sidings save train time 465.2 KB |
Track circuit developments in Europe 234.8 KB |
Elevation causes signal changes 893.2 KB |
More automation for signaling in 1957 1.2 MB |
GN CTC's 175 miles of mainline 635.9 KB |
How long sidings save train time 465.2 KB |
More automation for signaling in 1957 1.2 MB |
Seaway diverts CN mainline 532.3 KB |
Why not more Centralized Traffic Control? 344.2 KB |
Seaway diverts CN mainline 532.3 KB |
Survey shows progress in signal education 330.6 KB |
CTC on the SP has special devices 518.8 KB |
Lehigh Valley combines interlockings 404.0 KB |
How long sidings save train time 465.2 KB |
Seaway diverts CN mainline 532.3 KB |
Lehigh Valley combines interlockings 404.0 KB |
GN CTC's 175 miles of mainline 635.9 KB |
Lehigh Valley combines interlockings 404.0 KB |
How long sidings save train time 465.2 KB |
GN CTC's 175 miles of mainline 635.9 KB |
CTC on the SP has special devices 518.8 KB |
Consolidation cuts costs 1.1 MB |
Consolidation cuts costs 1.1 MB |
CTC on the SP has special devices 518.8 KB |
GN CTC's 175 miles of mainline 635.9 KB |
What's the answer: Slotting relay? 361.2 KB |
Track circuit developments in Europe 234.8 KB |
What's the Answer: Spring switches? 200.0 KB |
How to make non-stop meet with CTC 576.9 KB |
Track circuit developments in Europe 234.8 KB |
Elevation causes signal changes 893.2 KB |
Track circuit developments in Europe 234.8 KB |
GN CTC's 175 miles of mainline 635.9 KB |
More automation for signaling in 1957 1.2 MB |
CTC on the SP has special devices 518.8 KB |
GN CTC's 175 miles of mainline 635.9 KB |
How to make non-stop meet with CTC 576.9 KB |
Lehigh Valley combines interlockings 404.0 KB |
1957 index 2.9 MB |
How long sidings save train time 465.2 KB |
Consolidation cuts costs 1.1 MB |
Elevation causes signal changes 893.2 KB |
Lehigh Valley combines interlockings 404.0 KB |
More automation for signaling in 1957 1.2 MB |
One Machine Controls Two Plants 2.2 MB |
Relay Interlocking Saves Time at Yard Entrances 2.5 MB |
Seaway diverts CN mainline 532.3 KB |
Two interlockings save time and money 547.8 KB |
Lehigh Valley combines interlockings 404.0 KB |
How long sidings save train time 465.2 KB |
How to make non-stop meet with CTC 576.9 KB |
Kinks. Testing "KP" relays 191.2 KB |
More automation for signaling in 1957 1.2 MB |
How long sidings save train time 465.2 KB |
Lehigh Valley combines interlockings 404.0 KB |
What's the answer: Slotting relay? 361.2 KB |
GN CTC's 175 miles of mainline 635.9 KB |
Seaway diverts CN mainline 532.3 KB |
How to make non-stop meet with CTC 576.9 KB |
How long sidings save train time 465.2 KB |
How long sidings save train time 465.2 KB |
GN CTC's 175 miles of mainline 635.9 KB |
Lehigh Valley combines interlockings 404.0 KB |
Consolidation cuts costs 1.1 MB |
ICC Reports on NYC wreck 205.5 KB |
GN CTC's 175 miles of mainline 635.9 KB |
How to make non-stop meet with CTC 576.9 KB |
Seaway diverts CN mainline 532.3 KB |
What's the answer: Slotting relay? 361.2 KB |
Lehigh Valley has check-in, check-out 755.3 KB |
Track circuit developments in Europe 234.8 KB |
What's the answer: Slotting relay? 361.2 KB |
CTC on the SP has special devices 518.8 KB |
How long sidings save train time 465.2 KB |
More automation for signaling in 1957 1.2 MB |
Survey shows progress in signal education 330.6 KB |
What's the answer: Slotting relay? 361.2 KB |
Seaway diverts CN mainline 532.3 KB |
Consolidation cuts costs 1.1 MB |
How to make non-stop meet with CTC 576.9 KB |
Kinks. Testing "KP" relays 191.2 KB |
Track circuit developments in Europe 234.8 KB |
Consolidation cuts costs 1.1 MB |
Survey shows progress in signal education 330.6 KB |
Track circuit developments in Europe 234.8 KB |
Track circuit developments in Europe 234.8 KB |
Consolidation cuts costs 1.1 MB |
Track circuit developments in Europe 234.8 KB |
CTC on the SP has special devices 518.8 KB |
GN CTC's 175 miles of mainline 635.9 KB |
Elevation causes signal changes 893.2 KB |
How to make non-stop meet with CTC 576.9 KB |
How long sidings save train time 465.2 KB |