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.
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1954 | New Wayside and Cab Signaling 753.2 KB |
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1949 | Signal Research and Development 2.9 MB |
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1941 | Monon Changes Approved 760.8 KB |
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1931 | Centralized Traffic Control Installed on Wabash 5.6 MB |
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1942 | Chicago, Indianapolis & Louisiville Modernizes Automatic Signaling 3.9 MB |
1941 | Monon Changes Approved 760.8 KB |
1940 | Wabash Installs Gate and Signal Protection for All Crossings in Lafayette 4.9 MB |
1935 | Letter to the Editor: Use of Cab Signals 1.2 MB |
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1954 | Automatic Gates Increase Safety 3.2 MB |
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1926 | North Shore Line Installs Two Electric Interlockers 2.1 MB |
1920 | Modern Telegraph Office at Indianapolis 3.1 MB |
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1954 | Automatic Gates Increase Safety 3.2 MB |
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1919 | A Peculiar Accident 251.7 KB |
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1911 | Interlocking on the North Western Terminal 7.6 MB |
1925 | Maintenance on C&NW Terminals 12.5 MB |
1911 | Signaling and Interlocking on the North Western Terminal in Chicago 1.1 MB |
1943 | Centralized Traffic Control on the Milwaukee 2.8 MB |
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1935 | Safety of High Speed Trains 5.2 MB |
1913 | New Signaling Across the Great Salt Lake 2.2 MB |
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1954 | Loudspeakers and Interlocking Improve Yard Operation 4.7 MB |
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1949 | Modern Signaling on a Division 6.6 MB |
1927 | A Reserve Filament Device to Prevent Light-Out Failures 529.8 KB |
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1921 | A Complete Train Despatching System 1.7 MB |
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1921 | A Complete Train Despatching System 1.7 MB |
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1937 | Signaling Eliminates Platform Maintenance 3.9 MB |
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1937 | Signaling at Lap Sidings 1.1 MB |
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1937 | Signaling at Lap Sidings 2.6 MB |
1945 | Milwaukee Installs CTC On 51 Miles 6.5 MB |
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1945 | The New Connections at Kansas City For Milwaukee and Rock Island 4.7 MB |
1922 | Signal Construction on the Santa Fe 797.6 KB |
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1944 | Railroad Applications of Electronics 1.9 MB |
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1944 | Track Circuits on Passing Tracks in CTC Territory 941.8 KB |
1943 | Union Pacific Installs CTC on 175 Miles of Single Track 13.2 MB |
1923 | Automatics on Paris Grande Ceinture 5.0 MB |
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1911 | Automatic Signals on the Northern Pacific 6.3 MB |
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1922 | Signal Construction on the Santa Fe 797.6 KB |
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1936 | Approach Electric Lighting On the Erie 2.7 MB |
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1942 | Chicago's Newest Subway Has Automatic Block Signaling and Train Stop 457.5 KB |
1947 | Annual Review and Outlook 425.1 KB |
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1938 | Relay Interlocking at Leeds 4.3 MB |
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1924 | Controlled Manual Block Signaling With Train Control 5.5 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1950 | CTC on the Reading 6.6 MB |
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1949 | An Unusual Automatic Plant 4.5 MB |
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1950 | Centralized Train Dispatching 1.4 MB |
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1936 | Flood Damage to Signaling 5.0 MB |
1943 | Herbert S. Balliet obituary 609.4 KB |
1925 | Light Signals, Color, Position, or Color-Position 1.5 MB |
1921 | Proposed Modification of Stop-and-Proceed Rule 1.4 MB |
1936 | Railroads Clean Up After Flood Waters 33.3 MB |
1930 | Signal Aspects for a Four Block System 2.8 MB |
1950 | Temporary Change of Signal Controls 2.2 MB |
1925 | The Train Control Situation 853.0 KB |
1926 | Train Control Progress in 1925 3.1 MB |
1923 | Train-Order Signals at Interlockers 3.6 MB |
1923 | News of the Month (October 1923) 1.9 MB |
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1936 | Alining Signals on Curves 3.7 MB |
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1940 | Signal Lens Cleaner 1.1 MB |
1947 | Canadian Pacific Installs Absolute Permissive Block 779.4 KB |
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1956 | The Crossing Accident Problem 986.5 KB |
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1918 | Mechanical Signaling 222.3 KB |
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1945 | The Leverman's Viewpoint 427.0 KB |
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1924 | Results of Train Control Test on Pennsylvania 3.1 MB |
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1946 | CTC on 121 Miles of the Cotton Belt 6.4 MB |
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1923 | Chicago & Alton Installation of Train Control 1.4 MB |
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1954 | Automatic Gates Increase Safety 3.2 MB |
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1926 | Scientific Study of Light Signals 3.3 MB |
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1935 | Avoiding Light-Out Signal Failures 2.2 MB |
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1935 | Avoiding Light-Out Signal Failures 1.2 MB |
1950 | New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB |
1950 | Rules, Standards and Instructions 1.5 MB |
1925 | A Study of the Causes of Lightning 2.0 MB |
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1935 | An Improved Track Circuit for Light-Weight Equipment 2.4 MB |
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1956 | How to Control Signals Safely Where Lightweight Trains are Operated 8.4 MB |
1937 | Track Shunting Problems 947.3 KB |
1937 | Track Shunting Problems 2.5 MB |
1936 | C&O Remote Control 12.8 MB |
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1947 | ICC Holds Signal Hearing 507.5 KB |
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1929 | Interlocking Controlled Remotely 2.7 MB |
1930 | New Electric Interlocking on the Burlington Eliminates 160 Train Stops Per Day 2.8 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1935 | Safety of High Speed Trains 5.2 MB |
1937 | Cut-Out Control for Crossing Signals 3.0 MB |
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1935 | Aerial Cable Versus Open Line 3.9 MB |
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1935 | Pole Lines for Automatic Signaling 1.6 MB |
1940 | Southern Pacific Washes Insulators 1.5 MB |
1937 | Automatic Signals on Litchfield & Madison 3.5 MB |
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1911 | Automatic Signals on the Northern Pacific 6.3 MB |
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1947 | CTC Saves Train Time on the Pennsylvania 1.5 MB |
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1956 | Release of Locking 3.7 MB |
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1937 | Signal Construction on the Wabash 12.2 MB |
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1952 | CTC Pays Its Way on B&O 733.2 KB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1939 | 230 Routes In a Relay Interlocking 2.3 MB |
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1934 | Highway Crossing Protection in England 1.3 MB |
1935 | Mechanical Color Light Signals in England 1.3 MB |
1938 | Relay Interlocking at Leeds 4.3 MB |
1932 | Speed Signaling in England 1.9 MB |
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1934 | Re-Signaling the London North Eastern of England 3.0 MB |
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1931 | British Report on Automatic Train Control 2.6 MB |
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1931 | British Report on Automatic Train Control 2.6 MB |
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1926 | Four-Aspect Color-Light Signals Installed on English Road 2.8 MB |
1931 | Metropolitan Railway of London Resignaling with Modern Equipment 1.8 MB |
1936 | New Interlocking Machines Abroad 1.3 MB |
1934 | Paddington Power Signaling 1.9 MB |
1934 | Electro-Pneumatic Interlocking on the Long Island 3.8 MB |
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1950 | Increasing Use of Carrier 1.3 MB |
1943 | Long Island Replaces Interlocking Machine 3.4 MB |
1950 | Microwaves on Railroads 1.3 MB |
1939 | Signaling the Pennsylvania to New York World's Fair 4.2 MB |
1952 | Speed Control Installed on the Long Island 1.3 MB |
1923 | Train-Order Signals at Interlockers 3.6 MB |
1947 | ICC Holds Signal Hearing 507.5 KB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1948 | New Signaling In Texas on Missouri Pacific Lines 1.8 MB |
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1949 | Texas & Pacific New All-Relay Interlocking 4.3 MB |
1944 | Track Circuits on Passing Tracks in CTC Territory 941.8 KB |
1911 | The Staff System on the Southern Pacific 4.0 MB |
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1928 | Obituary: Frank P. Patenall 627.0 KB |
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1939 | Mission Tower Interlocking at Los Angeles 9.2 MB |
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1939 | New Interlocking at Los Angeles 9.6 MB |
1934 | An Electric Interlocking on the Southern Pacific 1.8 MB |
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1935 | Automatic Interlockings of Two Junctions Involving Spring Switches 8.9 MB |
1947 | ICC Holds Signal Hearing 507.5 KB |
1939 | Mission Tower Interlocking at Los Angeles 9.2 MB |
1939 | New Interlocking at Los Angeles 9.6 MB |
1943 | Pacific Electric Installs a Large All-Relay Interlocking 5.3 MB |
1928 | Pacific Electric Protects Subway Traffic With Signals and Train Stops 2.4 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1935 | Safety of High Speed Trains 5.2 MB |
1944 | Santa Fe Installs CTC on 115.6 Miles Los Angeles to San Diego 7.2 MB |
1936 | Street Traffic Signals Controlled by Trains 5.1 MB |
1923 | CB&Q Installs New Light Signals 4.1 MB |
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1937 | Illumination as a Type of Crossing Protection 3.0 MB |
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1929 | Manual Block Signals Controlled Remotely on the Big Four 1.1 MB |
1949 | New Interlocking in Louisville 5.3 MB |
1937 | Ohio Flood Damages Signaling 9.7 MB |
1941 | Pennsylvania Installs CTC at Louisville, KY 4.9 MB |
1935 | Obsolescence in Signaling 3.4 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
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1913 | New Signaling Across the Great Salt Lake 2.2 MB |
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1913 | New Signaling Across the Great Salt Lake 2.2 MB |
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1947 | Southern Pacific Installs CTC 990.2 KB |
1954 | Wabash Yard Moves Expedited 1.2 MB |
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1949 | A Century of Signal Glass Developments 4.2 MB |
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1956 | Burlington Has Compact Control Machine for Consolidation of 14 Interlockings 11.3 MB |
1935 | Letter to the Editor- Comment on Multiple Aspects 1.5 MB |
1950 | Lunar White 419.3 KB |
1935 | Multiple Aspect Signaling 3.3 MB |
1937 | Seaboard Utilizes Spring Switches 8.4 MB |
1950 | Spring Switch Signaling 2.5 MB |
1949 | Texas & Pacific New All-Relay Interlocking 4.3 MB |
1950 | CTC on the Reading 6.6 MB |
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1941 | CTC Installed on Norfolk & Western 5.1 MB |
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1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
1947 | ICC Holds Signal Hearing 507.5 KB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |