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.
1940 | Entering the Main Line 1.3 MB |
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1940 | 1940 index 3.9 MB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
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1940 | Entering the Main Line 1.3 MB |
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1940 | Proceeding By a Head-Block Signal 1.9 MB |
1940 | Single-Track Signaling 2.5 MB |
1940 | Panama Limited Collides With Louisiane 1.0 MB |
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1940 | Two Accidents on the Illinois Central 2.8 MB |
1940 | ATC Tests Ordered 676.8 KB |
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1940 | Hook-On Volt-Ammeter 1.3 MB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | Panama Limited Collides With Louisiane 1.0 MB |
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1940 | Two Accidents on the Illinois Central 2.8 MB |
1940 | Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB |
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1940 | Interlockings Installed at Two Crossings 6.5 MB |
1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | A Review of 1939 and a Glance Into 1940 1.6 MB |
1940 | Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB |
1940 | Entering the Main Line 1.3 MB |
1940 | Intermediate Signal Spacing and Control 2.1 MB |
1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
1940 | New Signaling on the Wabash 8.1 MB |
1940 | Proceeding By a Head-Block Signal 1.9 MB |
1940 | Single-Track Signaling 2.5 MB |
1940 | Southern Pacific Petition Denied 3.0 MB |
1940 | ATC Tests Ordered 676.8 KB |
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1940 | Illinois Central Order 1.3 MB |
1940 | Panama Limited Collides With Louisiane 1.0 MB |
1940 | Two Accidents on the Illinois Central 2.8 MB |
1940 | Interlockings Installed at Two Crossings 6.5 MB |
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1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
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1940 | Cadweld (Thermex) Signal Bonds 996.4 KB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | ATC Tests Ordered 676.8 KB |
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1940 | Illinois Central Order 1.3 MB |
1940 | CTC on the New York, Ontario & Western 8.2 MB |
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1940 | Cadweld (Thermex) Signal Bonds 996.4 KB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | A Change in the Requisites, Definitions and Regulations 1.2 MB |
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1940 | A Review of 1939 and a Glance Into 1940 1.6 MB |
1940 | Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB |
1940 | CTC on the New York, Ontario & Western 8.2 MB |
1940 | Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB |
1940 | Single-Track Signaling 2.5 MB |
1940 | Train Order Signals 4.2 MB |
1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Single-Track Signaling 2.5 MB |
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1940 | Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB |
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1940 | Interlockings Installed at Two Crossings 6.5 MB |
1940 | Drafting Boards 1.8 MB |
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1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
1940 | Obituary: Leroy Wyant 1.0 MB |
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1940 | Signal Lens Cleaner 1.1 MB |
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1940 | Interlockings Installed at Two Crossings 6.5 MB |
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1940 | Mechanical Plant Modernized 4.2 MB |
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1940 | Coded Track Control 2.5 MB |
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1940 | New Code Transmitter 2.1 MB |
1940 | Coded Track Control 2.5 MB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | A Review of 1939 and a Glance Into 1940 1.6 MB |
1940 | Coded Signaling Control System on the Norfolk & Western 10.0 MB |
1940 | Coded Track Control 2.5 MB |
1940 | Mechanical Plant Modernized 4.2 MB |
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1940 | Signal Lens Cleaner 1.1 MB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | CTC on the New York, Ontario & Western 8.2 MB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Coded Track Control 2.5 MB |
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1940 | Southern Pacific Petition Denied 3.0 MB |
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1940 | New Code Transmitter 2.1 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Drafting Boards 1.8 MB |
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1940 | Entering the Main Line 1.3 MB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Facing Point Lock for Spring Switches 1.2 MB |
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1940 | Facing Point Locks On Main Line Switches 2.6 MB |
1940 | New Signaling on the Wabash 8.1 MB |
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1940 | Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB |
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1940 | St. Louis Terminal 403.1 KB |
1940 | Entering the Main Line 1.3 MB |
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1940 | Flasher Relay 1.7 MB |
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1940 | New Signaling on the Wabash 8.1 MB |
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1940 | Coded Track Control 2.5 MB |
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1940 | Controller Adjuster 1.3 MB |
1940 | Facing Point Lock for Spring Switches 1.2 MB |
1940 | Interlockings Installed at Two Crossings 6.5 MB |
1940 | New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB |
1940 | New Searchlight Signal 2.7 MB |
1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
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1940 | Interlockings Installed at Two Crossings 6.5 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | New Signaling on the Wabash 8.1 MB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Interlockings Installed at Two Crossings 6.5 MB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
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1940 | ATC Tests Ordered 676.8 KB |
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1940 | Illinois Central Order 1.3 MB |
1940 | Panama Limited Collides With Louisiane 1.0 MB |
1940 | Two Accidents on the Illinois Central 2.8 MB |
1940 | Signal Lens Cleaner 1.1 MB |
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1940 | 1940 index 3.9 MB |
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1940 | Testing Insulated Joints 2.1 MB |
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1940 | Southern Pacific Washes Insulators 1.5 MB |
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1940 | A Change in the Requisites, Definitions and Regulations 1.2 MB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
1940 | Interlockings Installed at Two Crossings 6.5 MB |
1940 | Movable Interlocking Towers 1.2 MB |
1940 | New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB |
1940 | Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB |
1940 | Remote Control On the Southern 3.8 MB |
1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
1940 | Trap Circuit 872.0 KB |
1940 | Movable Interlocking Towers 1.2 MB |
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1940 | A Change in the Requisites, Definitions and Regulations 1.2 MB |
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1940 | A Review of 1939 and a Glance Into 1940 1.6 MB |
1940 | ATC Tests Ordered 676.8 KB |
1940 | Illinois Central Order 1.3 MB |
1940 | Single-Track Signaling 2.5 MB |
1940 | Southern Pacific Petition Denied 3.0 MB |
1940 | Trap Circuit 872.0 KB |
1940 | Remote Control On the Southern 3.8 MB |
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1940 | Signal Lens Cleaner 1.1 MB |
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1940 | Southern Pacific Washes Insulators 1.5 MB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | A Review of 1939 and a Glance Into 1940 1.6 MB |
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1940 | Train Order Signals 4.2 MB |
1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
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1940 | Coded Track Control 2.5 MB |
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1940 | New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB |
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1940 | Train Order Signals 4.2 MB |
1940 | "Running" Passing Tracks 1.1 MB |
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1940 | Proceeding By a Head-Block Signal 1.9 MB |
1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
1940 | Single-Track Signaling 2.5 MB |
1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Controller Adjuster 1.3 MB |
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1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
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1940 | Make-Up-Time Chart 813.1 KB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Trap Circuit 872.0 KB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
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1940 | Signal Lens Cleaner 1.1 MB |
1940 | CTC on the New York, Ontario & Western 8.2 MB |
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1940 | Single-Track Signaling 2.5 MB |
1940 | D.C. Test Set For Relays, Slots 3.7 MB |
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1940 | Obituary: Leroy Wyant 1.0 MB |
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1940 | Southern Pacific Petition Denied 3.0 MB |
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1940 | "Running" Passing Tracks 1.1 MB |
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1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1940 | Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB |
1940 | Pennsylvania Testing Procedure 16.6 MB |
1940 | Pennsylvania Testing Procedure (Part II) 8.6 MB |
1940 | Pennsylvania Testing Procedure (Part III) 8.9 MB |
1940 | Obituary: Leroy Wyant 1.0 MB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | D.C. Test Set For Relays, Slots 3.7 MB |
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1940 | Effecting Time Delay for Relays 933.3 KB |
1940 | Remote Control On the Southern 3.8 MB |
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1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
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1940 | Make-Up-Time Chart 813.1 KB |
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1940 | New Searchlight Signal 2.7 MB |
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1940 | New Signaling on the Wabash 8.1 MB |
1940 | Controller Adjuster 1.3 MB |
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1940 | New Searchlight Signal 2.7 MB |
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1940 | Single-Track Signaling 2.5 MB |
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1940 | Pennsylvania Testing Procedure 16.6 MB |
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1940 | Pennsylvania Testing Procedure (Part II) 8.6 MB |
1940 | Pennsylvania Testing Procedure (Part III) 8.9 MB |
1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1940 | Intermediate Signal Spacing and Control 2.1 MB |
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1940 | Remote Control On the Southern 3.8 MB |
1940 | Southern Pacific Petition Denied 3.0 MB |
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1940 | Southern Pacific Washes Insulators 1.5 MB |
1940 | Facing Point Lock for Spring Switches 1.2 MB |
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1940 | Facing Point Locks On Main Line Switches 2.6 MB |
1940 | Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB |
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1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
1940 | St. Louis Terminal 403.1 KB |
1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
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1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Facing Point Locks On Main Line Switches 2.6 MB |
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1940 | Testing Switches 1.1 MB |
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1940 | Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB |
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1940 | St. Louis Terminal 403.1 KB |
1940 | D.C. Test Set For Relays, Slots 3.7 MB |
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1940 | Hook-On Volt-Ammeter 1.3 MB |
1940 | Testing Insulated Joints 2.1 MB |
1940 | Testing Switches 1.1 MB |
1940 | Shunting Straps for Testing 890.4 KB |
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1940 | Make-Up-Time Chart 813.1 KB |
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1940 | Effecting Time Delay for Relays 933.3 KB |
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1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
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1940 | Testing Insulated Joints 2.1 MB |
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1940 | Train Order Signals 4.2 MB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
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1940 | Trap Circuit 872.0 KB |
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1940 | Southern Pacific Petition Denied 3.0 MB |
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1940 | New Searchlight Signal 2.7 MB |
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1940 | CTC on the New York, Ontario & Western 8.2 MB |
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1940 | Interlocking on the Hudson & Manhattan 6.8 MB |
1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
1940 | New Code Transmitter 2.1 MB |
1940 | New Signaling on the Wabash 8.1 MB |
1940 | Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB |
1940 | Plug Couplers for Relays and Signals 1.3 MB |
1940 | Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB |
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1940 | Interlockings Installed at Two Crossings 6.5 MB |
1940 | New Signaling on the Wabash 8.1 MB |
1940 | Single-Track Signaling 2.5 MB |
1940 | Wabash Installs Gate and Signal Protection for All Crossings in Lafayette 4.9 MB |
1940 | Personal: Changes on the New York Central 2.2 MB |
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1940 | Obituary: Leroy Wyant 1.0 MB |
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