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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1958 | DL&W-Erie joint operation is ready to go 643.6 KB |
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1959 | B&M takes up track and installs traffic control, gates and flashers 745.0 KB |
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1940 | Facing Point Lock for Spring Switches 1.2 MB |
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 |
1957 | What's the Answer: Spring switches? 200.0 KB |
1963 | Solid State Devices 938.4 KB |
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1911 | Automatic Signals on the Chicago Great Western 7.4 MB |
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1962 | News briefs. 1962-02 1.4 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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1959 | Burlington installs modified CTC 1.0 MB |
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1963 | News briefs. 1963-05 720.2 KB |
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1963 | News briefs. 1963-11 1.4 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 |
1959 | Decrease in signal failures 336.5 KB |
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1958 | Decrease in signal failures reported by ICC Bureau of Safety 629.9 KB |
1951 | ICC Bureau of Safety Report 740.4 KB |
1963 | ICC Reports on Signaling 959.4 KB |
1964 | ICC Reports on Signaling 954.4 KB |
1960 | ICC Reports RR safety 554.4 KB |
1957 | Increase in signal failures reported by ICC Bureau of Safety 652.1 KB |
1965 | Signal failures reported by ICC 1.1 MB |
1965 | Collision due to signal failure 647.8 KB |
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1947 | False Clear Signal 1.0 MB |
1965 | Indication locking inadequate says ICC in report 844.7 KB |
1955 | Fewer signal failures 645.3 KB |
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1961 | ICC Reports on Railroad Safety 189.7 KB |
1959 | Decrease in signal failures 336.5 KB |
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1958 | Decrease in signal failures reported by ICC Bureau of Safety 629.9 KB |
1951 | ICC Bureau of Safety Report 740.4 KB |
1963 | ICC Reports on Signaling 959.4 KB |
1960 | ICC Reports RR safety 554.4 KB |
1957 | Increase in signal failures reported by ICC Bureau of Safety 652.1 KB |
1965 | Signal failures reported by ICC 1.1 MB |
1955 | Fewer signal failures 645.3 KB |
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1947 | ICC Signal Hearings 179.7 KB |
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1961 | News briefs. 1961-12 978.0 KB |
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1955 | How to run reverse temporarily 197.6 KB |
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1958 | Split-channel radio 649.4 KB |
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1937 | Signal Inspection Bill Passed by Congress 3.4 MB |
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1916 | AC Signaling in the Centre Street Loop 924.9 KB |
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1920 | Electric Interlocking at Bellefontaine, Ohio 3.8 MB |
1910 | Electric Interlocking at Griffith, Indiana 964.1 KB |
1915 | General Railway Signal Company and Federal Signal Company Consolidated 986.1 KB |
1915 | New Interlockers on the Flint Belt Line 2.2 MB |
1916 | Service Record of Position-Light Signals 580.8 KB |
1918 | New Electric Interlocking at Clyde, IL 418.7 KB |
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1960 | News briefs. 1960-06 1.2 MB |
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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 |
1958 | DL&W-Erie joint operation is ready to go 643.6 KB |
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1957 | Bessemer takes up second track and installs Centralized Traffic Control 700.5 KB |
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1943 | CTC on the Bessemer & Lake Erie 8.7 MB |
1916 | Signaling the Milwaukee's Electric Zone 624.8 KB |
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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 |
1959 | Fewer wayside observers makes automatic hazard detection necessary 1.1 MB |
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1939 | Special Aspects for Detectors 937.0 KB |
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 |
1947 | Flasher Relay 1.3 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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1951 | A History of Flashing-Light Crossing Signals- What They Are and Why 570.5 KB |
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1935 | Crossing Bells at Flasher Signals 1.9 MB |
1965 | Crossing protection gets new look 490.1 KB |
1959 | D&H upgrades crossing protection 626.4 KB |
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 |
1917 | Flash Lights on the P&R 920.4 KB |
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1913 | The AGA flashlight a success in Sweden 331.0 KB |
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1955 | Much is new in signaling for 1955 826.7 KB |
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1959 | AFO circuits protect crossing 554.0 KB |
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1946 | DT&I Tests Radio 4.3 MB |
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 |
1962 | News briefs. 1962-05 826.8 KB |
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1959 | Fewer wayside observers makes automatic hazard detection necessary 1.1 MB |
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1950 | Flood Detectors on the Katy 2.7 MB |
1949 | New Automatic Block on the Katy 4.7 MB |
1958 | RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB |
1947 | CTC Down by the Ohio 2.7 MB |
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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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1963 | News briefs. 1963-01 951.3 KB |
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1964 | News briefs. 1964-05 1.0 MB |
1964 | News briefs. 1964-10 768.6 KB |
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 |
1960 | News briefs. 1960-08 603.8 KB |
1962 | News briefs. 1962-02 1.4 MB |
1962 | News briefs. 1962-09 829.8 KB |
1963 | News briefs. 1963-11 1.4 MB |
1964 | News briefs. 1964-07 833.0 KB |
1964 | News briefs. 1964-08 811.5 KB |
1964 | News briefs. 1964-12 981.5 KB |
1965 | News briefs. 1965-07 788.2 KB |
1965 | News briefs. 1965-10 1.1 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 388.2 KB |
1930 | What Protection at Drawbridges? 3.5 MB |
1960 | What’s the answer? Automatic OS 354.1 KB |
1961 | Digital Computer Simulates CTC Dispatcher 2.8 MB |
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1939 | An Improved Flasher Relay 1.8 MB |
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1937 | New Devices- March 1937 18.1 MB |
1947 | Flasher Relay 1.3 MB |
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1941 | Monon Changes Approved 760.8 KB |
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1953 | Canadian National Adapts CTC to Traffic of 12 Trains Daily 7.5 MB |
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1959 | Pushbutton console for CTC 785.3 KB |
1935 | New Signaling on the Route of the C&NW "400" 9.6 MB |
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1964 | News briefs. 1964-02 981.5 KB |
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1965 | News briefs. 1965-05 1.4 MB |
1936 | Lost Motion in Locking 3.0 MB |
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1924 | New Interlocking Construction Ideas 3.4 MB |
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1955 | CTC and cab signaling on Union Pacific 789.5 KB |
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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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1965 | News briefs. 1965-08 742.1 KB |
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1947 | Railroads Request Relief from the ICC Signal Order 365.7 KB |
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1955 | Crossing protection for 16 streets 371.1 KB |
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1955 | Interlocking Expedites Terminal Moves 1.6 MB |
1960 | News briefs. 1960-10 1.8 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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1947 | Burlington Uses Radio on Switchers 909.1 KB |
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1965 | News briefs. 1965-11 1.2 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 |
1962 | News briefs. 1962-11 468.1 KB |
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1954 | NYC Combines Interlockings 2.4 MB |
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 |
1960 | Remote control train: Successful tests in France 209.9 KB |
1924 | Three-Indication Distant Signals on Alsace-Lorraine Railways 2.7 MB |
1947 | Railroads Request Relief from the ICC Signal Order 365.7 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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1947 | Medals Awarded by Franklin Institute 236.3 KB |
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1948 | Gates at Three Crossings on Soo Line 1.8 MB |
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1916 | Some Examples of Early Signaling 351.5 KB |
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1947 | All-Relay Interlockings On the RF&P 1.3 MB |
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1947 | Choice of Interlocking Control Machines 266.5 KB |
1942 | Automatic Signal Program on the Illinois Central 4.6 MB |
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1962 | News briefs. 1962-02 1.4 MB |
1949 | A. A. Freiberger 827.1 KB |
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1950 | Modern Communications In Yards and Terminals 1.4 MB |
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1962 | Electronic Track Circuits 740.3 KB |
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1960 | Remote control train: Successful tests in France 209.9 KB |
1946 | ICC 50-MPH Signal Hearing 6.9 MB |
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1964 | News briefs. 1964-02 981.5 KB |
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1965 | News briefs. 1965-01 2.0 MB |
1965 | News briefs. 1965-07 788.2 KB |
1965 | News briefs. 1965-08 742.1 KB |
1962 | Automatic Dispatching 2.1 MB |
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1957 | How to make non-stop meet with CTC 576.9 KB |
1955 | News briefs. 1955-08 830.4 KB |
1960 | News briefs. 1960-03 1.9 MB |
1960 | News briefs. 1960-05 1.0 MB |
1962 | News briefs. 1962-02 1.4 MB |
1962 | News briefs. 1962-10 461.7 KB |
1962 | News briefs. 1962-11 468.1 KB |
1964 | News briefs. 1964-04 1.3 MB |
1926 | Train Control Progress in 1925 3.1 MB |
1965 | Midwest RRs fight the weather 914.4 KB |
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1962 | News briefs. 1962-02 1.4 MB |
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1963 | News briefs. 1963-11 1.4 MB |
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1926 | Train Control Progress in 1925 3.1 MB |
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1955 | News briefs. 1955-08 830.4 KB |
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1955 | How CN increased track capacity 516.4 KB |
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1964 | News briefs. 1964-12 981.5 KB |
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1951 | New NYC Interlocking Controlled by Synchrostep 1.2 MB |
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1955 | CTC moves trains on grades 762.8 KB |
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1965 | Merging divisions require changing circuits 339.6 KB |
1950 | CTC on the Wabash 2.6 MB |
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1961 | News briefs. 1961-11 1.3 MB |
1965 | News briefs. 1965-07 788.2 KB |
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 |
1955 | How CN increased track capacity 516.4 KB |
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1960 | What’s the answer? Automatic OS 354.1 KB |
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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 388.2 KB |
1935 | Centralized Traffic Control on the Texas & Pacific 5.1 MB |
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1960 | News briefs. 1960-03 1.9 MB |
1955 | Santa Fe installs CTC on single track 610.2 KB |
1960 | T&P moves CTC machine 78 miles 423.0 KB |
1947 | Railroads Request Relief from the ICC Signal Order 365.7 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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1960 | News briefs. 1960-05 1.0 MB |
1960 | News briefs. 1960-09 756.9 KB |
1960 | News briefs. 1960-10 1.8 MB |
1961 | News briefs. 1961-06 725.8 KB |
1961 | News briefs. 1961-11 1.3 MB |
1913 | Settled at Last 824.8 KB |
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1935 | The Rudd-Rhea Signaling Report of the Pennsylvania 9.7 MB |
1955 | One CTC Machine Replaces Three 451.9 KB |
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1937 | Flag and Torpedo Containers 903.1 KB |
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