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.
1944 | Track Circuits on Passing Tracks in CTC Territory 941.8 KB |
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1943 | Union Pacific Installs CTC on 175 Miles of Single Track 13.2 MB |
1924 | Low-Voltage Interlocking on C&NW 1.6 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1935 | Centralized Traffic Control on the Texas & Pacific 5.1 MB |
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1935 | Collision on the T&P 2.0 MB |
1936 | Reconstruction of Interlocking at the Dallas Union Terminal 14.8 MB |
1949 | Signaling Adapted to Traffic On the Rock Island 5.2 MB |
1947 | All-Relay Plant on the C&EI at Danville, Ill 915.6 KB |
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1947 | All-Relay Plant on the C&EI at Danville, Ill 915.6 KB |
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1911 | Automatic Signals on Vermillion River Bridge 986.3 KB |
1931 | Centralized Traffic Control Installed on Wabash 5.6 MB |
1948 | CTC Keeps ‘em Rollin’ on C&EI 2.1 MB |
1925 | Division Train Control Installation on C&EI Approved by ICC 2.9 MB |
1930 | Remotely Controlled Signals Replace Manual Block Station on New York Central 1.2 MB |
1911 | Signaling on the Illinois Traction System 1.5 MB |
1926 | Train Control Progress in 1925 3.1 MB |
1936 | Remote Control on the Pennsylvania 14.5 MB |
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1948 | CTC Big Help to GM&O 1.7 MB |
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1915 | Electric Interlocking at Davis, IL 766.6 KB |
1934 | An Electric Interlocking on the Southern Pacific 1.8 MB |
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1933 | New Interlockers – Reversion to Single Track 418.4 KB |
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1929 | Pennsylvania Installs APB Signaling on 86 Miles 3.7 MB |
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1935 | Switch-Stand Selector 1.9 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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1935 | DC Track Circuits 963.2 KB |
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1946 | DT&I Tests Radio 4.3 MB |
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1945 | Manual Block-Remote Control Developed On the Wabash 5.7 MB |
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1937 | Signal Construction on the Wabash 12.2 MB |
1930 | Wabash Tests Automatic Train Control with Cab-Lights 3.6 MB |
1954 | Wabash Yard Moves Expedited 1.2 MB |
1940 | Coded Track Control 2.5 MB |
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1929 | D&RGW Expedites Trains With Centralized Control 2.1 MB |
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1917 | Light Signals On CM&StP 781.9 KB |
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1917 | New C&NW Bascule Bridge Interlocking 761.1 KB |
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1929 | The Chicago & Alton Installs Mechanical Plant 1.3 MB |
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1925 | Approach Locking Circuit That Is Dependent Upon Signal Position 648.1 KB |
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1928 | Circuit Polarity at Relay Contacts 526.2 KB |
1932 | CTC Studies 977.5 KB |
1938 | Light Signals as Train Order Signals 731.0 KB |
1927 | Multiplicity of Circuits for Operating Call-on Arms 1.5 MB |
1931 | Protecting CTC Switches 2.9 MB |
1927 | Several Effective Trap Circuit Schemes 1.4 MB |
1927 | Should Motor Car Operators Watch Signals More Carefully 1.2 MB |
1933 | Signal or Rule? 1.1 MB |
1956 | Switch Machines for CTC 2.0 MB |
1938 | The Outlook for Signaling 1.3 MB |
1925 | The Train Control Situation 853.0 KB |
1926 | Train Control Progress in 1925 3.1 MB |
1937 | What is in Store for the Signal Field? 1.8 MB |
1937 | Delaware River Bridge Signaling 13.9 MB |
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1926 | DT&I Interlocking Machine Nickel-Plated When Rebuilt 602.1 KB |
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1946 | DT&I Tests Radio 4.3 MB |
1946 | War-Time Replacement of Interlocking on Pere Marquette 3.4 MB |
1941 | Signaling on 47 Miles of St. Louis Southwestern 12.6 MB |
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1949 | New Automatic Block on the Katy 4.7 MB |
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1941 | Automatic Signaling and Tunnel Protection On the Denver & Salt Lake 6.7 MB |
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1950 | CTC Extended on the Rio Grande 4.4 MB |
1946 | CTC on 128 Miles of Denver & Salt Lake 10.1 MB |
1941 | Non-Stop Permissive Signals 1.4 MB |
1944 | Signals Direct Trains at Junction On the Denver & Rio Grande Western and the Denver & Salt Lake 2.8 MB |
1941 | Automatic Signaling and Tunnel Protection On the Denver & Salt Lake 6.7 MB |
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1928 | Burlington Completes Automatic Signals Chicago to Denver 5.1 MB |
1950 | CTC Extended on the Rio Grande 4.4 MB |
1946 | CTC on 128 Miles of Denver & Salt Lake 10.1 MB |
1947 | ICC Holds Signal Hearing 507.5 KB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1935 | Safety of High Speed Trains 5.2 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1943 | Signals Ordered on the Kansas City Southern 1.4 MB |
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1939 | ICC Permits Removal of Derails 1.1 MB |
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1929 | The Year 1928 in Retrospect and the Outlook for 1929 1.5 MB |
1932 | A Call-On Signal Is Different from a Stop and Proceed Signal 667.6 KB |
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1935 | Auto Stop Installed on C&NW 7.2 MB |
1911 | General News (August 1911) 559.3 KB |
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1943 | Gates at Three Crossings on C&NW 3.4 MB |
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1948 | Gates at Three Crossings on Soo Line 1.8 MB |
1911 | General News (August 1911) 559.3 KB |
1913 | New Block Signaling on the North-Western 1.8 MB |
1919 | The Night Signal Indication 335.6 KB |
1931 | Three-Track Signaling on 13.5 Miles of the C&NW 5.4 MB |
1934 | Desk-Lever Interlocking Installed on Canadian National 1.2 MB |
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1922 | New Desk-Type Circuit Controller 1.6 MB |
1929 | Simplified Electric Interlocking Plant on Michigan Central.pdf 3.6 MB |
1932 | A Detector Bar Fails 1.5 MB |
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1932 | Detector Bars in 1932 419.4 KB |
1935 | New Interlocking in the Chicago Loop 4.0 MB |
1947 | Territories Involved in the ICC Signaling Order 399.0 KB |
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1937 | J. C. Mock Retires 1.4 MB |
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1940 | New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB |
1911 | Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB |
1955 | Interlocking Expedites Terminal Moves 1.6 MB |
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1915 | New Interlockers on the Flint Belt Line 2.2 MB |
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1941 | DT&I Installs Automatic Interlocking 5.0 MB |
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1926 | DT&I Interlocking Machine Nickel-Plated When Rebuilt 602.1 KB |
1932 | Electric Interlocking Constructed by the Nickel Plate 1.4 MB |
1927 | Half Interlocker on DT&I 565.6 KB |
1931 | Three-Track Signaling on 13.5 Miles of the C&NW 5.4 MB |
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1948 | CTC Keeps ‘em Rollin’ on C&EI 2.1 MB |
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1954 | CTC Increases Capacity of Double Track 4.2 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1941 | Signaling on 47 Miles of St. Louis Southwestern 12.6 MB |
1944 | St. Louis Southwestern Installs Centralized Traffic Control 6.9 MB |
1944 | Track Circuits on Passing Tracks in CTC Territory 941.8 KB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1922 | Signal Construction on the Santa Fe 797.6 KB |
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1950 | CTC on the Reading 6.6 MB |
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1935 | Obsolescence in Signaling 3.4 MB |
1912 | The Automatic Signal and the Local Circuit 1.9 MB |
1934 | More on Distant Signals 598.6 KB |
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1940 | Southern Pacific Petition Denied 3.0 MB |
1934 | Spring Derail for Drawbridge Protection 535.0 KB |
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1911 | Interlocking on the North Western Terminal 7.6 MB |
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1925 | Maintenance on C&NW Terminals 12.5 MB |
1911 | Signaling and Interlocking on the North Western Terminal in Chicago 1.1 MB |
1955 | C&O Consolidates Interlockings 3.2 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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1936 | Light-out Relay for AC or DC 2.3 MB |
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1936 | Power-Transfer Relay for Crossing Signals 3.5 MB |
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1950 | Retained-Neutral Neutral Relay 3.4 MB |
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1935 | An Under-Voltage Relay 1.2 MB |
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1937 | New Devices- March 1937 18.1 MB |
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1955 | New York Central’s CTC – It’s Four Tracks to Two 4.1 MB |
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1957 | Where Two Tracks Do the Work of Four 3.2 MB |
1937 | New Devices- March 1937 18.1 MB |
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1925 | Excellent Results for 35 Years on Burlington 1.5 MB |
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1931 | New Control System Used at Electric Interlocking on the Burlington 3.5 MB |
1954 | New Wayside and Cab Signaling 753.2 KB |
1940 | Plug Couplers for Relays and Signals 1.3 MB |
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1950 | Retained-Neutral Neutral Relay 3.4 MB |
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1950 | Retained-Neutral Neutral Relay 3.4 MB |
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1949 | A Century of Signal Glass Developments 4.2 MB |
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1943 | Progress in the Use of Coded Track Circuits 1.6 MB |
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1940 | Drafting Boards 1.8 MB |
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1937 | Prepare for Construction 1.2 MB |
1909 | Willson's Gummed Paper Letters and Figures 170.0 KB |
1909 | Willson's Gummed Paper Letters and Figures 598.7 KB |
1947 | Southern Pacific Installs CTC 990.2 KB |
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1950 | Audible Warning Sounded When Dragging Equipment Detectors Operate 4.2 MB |
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1939 | Drag Detectors Protect Bridges 3.2 MB |
1949 | Signal Indications to Stop Trains When Dragging Equipment Detectors Operate 922.0 KB |
1939 | Special Aspects for Detectors 937.0 KB |
1935 | Accident at Drawbridge 1.4 MB |
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1939 | Electric Interlocking on the New Haven 2.1 MB |
1941 | Southern Pacific Installs Interlocking at Drawbridge 6.3 MB |
1929 | Trap Circuit for Drawbridge 980.8 KB |
1947 | Drawbridge Interlocking on the Elgin, Joliet & Eastern 647.3 KB |
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1939 | Drag Detectors Protect Bridges 3.2 MB |
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1937 | Ends of Double Track Controlled by CTC 12.4 MB |
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1946 | G. H Dryden retires 455.7 KB |
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1911 | Letters to the Editor: A Difference of Opinion 739.6 KB |
1928 | Personal Mention: G. H. Dryden 432.7 KB |
1927 | The Color Position Light Signal (poem) 435.2 KB |
1956 | Switch Machines for CTC 2.0 MB |
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1956 | Switch Machines for CTC 985.3 KB |
1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
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1942 | Automatic Signal Program on the Illinois Central 4.6 MB |
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1911 | Automatic Signals on the Chicago Great Western 7.4 MB |
1936 | Signals Installed at 26 Crossings in Dubuque, IA 13.8 MB |
1944 | CTC Speeds Ore Traffic On the DM&IR 4.6 MB |
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1954 | New Interlocking on Leads to Docks Saves Time for Ore Trains 2.9 MB |
1944 | CTC Speeds Ore Traffic On the DM&IR 4.6 MB |
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1915 | Duluth Terminal Trestle Signaling 2.3 MB |
1954 | New Interlocking on Leads to Docks Saves Time for Ore Trains 2.9 MB |
1928 | Early APB Signaling 408.5 KB |
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1947 | Canadian Pacific Installs Absolute Permissive Block 779.4 KB |
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1944 | Railroad Applications of Electronics 1.9 MB |
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1911 | Automatic Signals on the Chicago Great Western 7.4 MB |
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1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
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1935 | Signaling in Dust Storms 2.3 MB |
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1950 | Approach Distances and Times 5.5 MB |
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1937 | Approach Locking on Dwarf Signals 1.2 MB |
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1937 | Phantom Indications of Dwarfs 1.3 MB |
1934 | Simplified Interlocking Speeds Train Operation 1.9 MB |
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