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.
1949 | New Interlocking in Louisville 5.3 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 |
1935 | Facing Point Locks on Switches 3.2 MB |
1935 | FPL Adjustment on Spring Switches 1.3 MB |
1911 | Automatic Signals on the Chicago Great Western 7.4 MB |
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1941 | Automatics Installed on the Wabash 4.0 MB |
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1934 | CTC Installed on the Baltimore & Ohio 2.1 MB |
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1931 | A Lesson from a False-Clear Failure 572.9 KB |
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1937 | False Clear Failures 2.0 MB |
1937 | Signal Inspection Bill Passed by Congress 3.4 MB |
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1920 | Electric Interlocking at Bellefontaine, Ohio 3.8 MB |
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1915 | General Railway Signal Company and Federal Signal Company Consolidated 986.1 KB |
1915 | New Interlockers on the Flint Belt Line 2.2 MB |
1918 | New Electric Interlocking at Clyde, IL 418.7 KB |
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1940 | New Signaling on the Wabash 8.1 MB |
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1937 | Signaling on the Wabash 3.7 MB |
1943 | CTC on the Bessemer & Lake Erie 8.7 MB |
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1940 | Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB |
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1921 | Fire Threatened Tie Up At Grand Central Terminal 1.5 MB |
1923 | Quick Restoration of Wire Service at Broad Street Station 3.5 MB |
1940 | St. Louis Terminal 403.1 KB |
1939 | Special Aspects for Detectors 937.0 KB |
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1944 | New York Central Installs Coded Track Circuits 3.9 MB |
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1940 | Entering the Main Line 1.3 MB |
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1939 | An Improved Flasher Relay 1.8 MB |
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1940 | Flasher Relay 1.7 MB |
1935 | Flashing Aspects 1.3 MB |
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1935 | Multiple Aspect Signaling 3.3 MB |
1949 | Varied Light Intensity 921.0 KB |
1943 | Crossing Protection on Milwaukee 5.7 MB |
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1935 | Crossing Bells at Flasher Signals 1.9 MB |
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1935 | Letter to the Editor: Highways vs. Railroads 1.7 MB |
1936 | Phantom Indications 1.8 MB |
1936 | Reducing Current at Flashing Relay Contacts 2.2 MB |
1913 | Flash Lights on the P&R 915.4 KB |
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1946 | DT&I Tests Radio 4.3 MB |
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1915 | New Interlockers on the Flint Belt Line 2.2 MB |
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1923 | New Interlockers on the Flint Belt Line 1.6 MB |
1958 | C&O Has Good Ideas in CTC 2.5 MB |
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1915 | New Interlockers on the Flint Belt Line 2.2 MB |
1923 | New Interlockers on the Flint Belt Line 1.6 MB |
1954 | CTC Increases Capacity of Double Track 4.2 MB |
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1938 | CTC on the Missouri Pacific 5.3 MB |
1950 | Flood Detectors on the Katy 2.7 MB |
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1949 | New Automatic Block on the Katy 4.7 MB |
1936 | Boston & Maine Flooded Signaling Rehabilitated 8.3 MB |
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1936 | Flood Damage to Signaling 5.0 MB |
1918 | Maintaining an Interlocking Plant at High Tide 241.8 KB |
1937 | Ohio Flood Damages Signaling 9.7 MB |
1936 | Railroads Clean Up After Flood Waters 33.3 MB |
1937 | Rectifiers in Flood Waters 972.4 KB |
1937 | Rehabilitating Flooded Signaling 1.4 MB |
1952 | Speed Control Installed on the Long Island 1.3 MB |
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1947 | Signaling and Interlocking in Italy 684.8 KB |
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1935 | Accident at Drawbridge 1.4 MB |
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1932 | Crossing Problem 2.6 MB |
1930 | Directional Approach Lighting 449.8 KB |
1932 | False Change of Lineup 850.0 KB |
1921 | New Interlockings at Jacksonville Terminal 3.4 MB |
1927 | Should Track Circuit Polarities be Staggered? 1.5 MB |
1935 | Signaling for Higher Train Speeds 3.0 MB |
1947 | Territories Involved in the ICC Signaling Order 399.0 KB |
1930 | What Protection at Drawbridges? 3.5 MB |
1939 | An Improved Flasher Relay 1.8 MB |
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1937 | New Devices- March 1937 18.1 MB |
1941 | Monon Changes Approved 760.8 KB |
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1935 | New Signaling on the Route of the C&NW "400" 9.6 MB |
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1936 | Lost Motion in Locking 3.0 MB |
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1924 | New Interlocking Construction Ideas 3.4 MB |
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1911 | Automatic Signals on the Chicago Great Western 7.4 MB |
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1941 | CTC Installed on Norfolk & Western 5.1 MB |
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1923 | Superintendents Discuss Form "19" 2.0 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1955 | Interlocking Expedites Terminal Moves 1.6 MB |
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1929 | Pennsylvania Installs APB Signaling on 86 Miles 3.7 MB |
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1954 | New Wayside and Cab Signaling 753.2 KB |
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1937 | Report of Committee X – Signaling Practice 2.9 MB |
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1939 | Problems of Four-Indication Signaling 1.6 MB |
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1950 | CTC Extended on the Rio Grande 4.4 MB |
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1930 | Color-light Automatic Block Signals and Automatic Interlocking 2.4 MB |
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1949 | Milwaukee Installs Automatic Block 8.2 MB |
1954 | NYC Combines Interlockings 2.4 MB |
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1922 | An Old Electric Interlocking in France 1.3 MB |
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1923 | Automatics on Paris Grande Ceinture 5.0 MB |
1924 | Electric Interlockings On the French Northern 4.4 MB |
1931 | French Railways Adopt Color-Light Signals 1.3 MB |
1924 | Three-Indication Distant Signals on Alsace-Lorraine Railways 2.7 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1941 | Frank Rhea (obituary) 1.0 MB |
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1923 | BRT Automatic Interlocking 1.9 MB |
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1948 | Gates at Three Crossings on Soo Line 1.8 MB |
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1942 | Automatic Signal Program on the Illinois Central 4.6 MB |
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1950 | Modern Communications In Yards and Terminals 1.4 MB |
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1946 | ICC 50-MPH Signal Hearing 6.9 MB |
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1926 | Train Control Progress in 1925 3.1 MB |
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1926 | Train Control Progress in 1925 3.1 MB |
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1950 | CTC on the Wabash 2.6 MB |
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1935 | Respacing Automatics on the Pennsylvania 1.8 MB |
1935 | Signaling for Higher Train Speeds 3.0 MB |
1926 | Train Control Progress in 1925 3.1 MB |
1950 | Grade Signal Controls 2.1 MB |
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1936 | Reconstruction of Interlocking at the Dallas Union Terminal 14.8 MB |
1947 | Territories Involved in the ICC Signaling Order 399.0 KB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1923 | BRT Automatic Interlocking 1.9 MB |
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1953 | IC Installs Automatic Block 4.0 MB |
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1937 | Flag and Torpedo Containers 903.1 KB |
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