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.
1936 | Train Control on the B&O Diesel 2.6 MB |
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1954 | Automatic Gates Increase Safety 3.2 MB |
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1938 | CTC on the Missouri Pacific 5.3 MB |
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1954 | CTC Increases Capacity of Double Track 4.2 MB |
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1947 | 107 Miles of CTC on the N&W 2.3 MB |
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1943 | Norfolk & Western Installs CTC on 14 Miles of Single Track 4.4 MB |
1946 | Carryphone on the Pennsylvania 1.5 MB |
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1950 | Increasing Use of Carrier 1.3 MB |
1954 | Loudspeakers and Interlocking Improve Yard Operation 4.7 MB |
1956 | Train Operations When CTC Fails 3.5 MB |
1956 | Train Operations When CTC Fails 2.4 MB |
1949 | Two-Way Radio Speeds Busy Terminal Operation 3.0 MB |
1956 | Walkie-Talkies 1.5 MB |
1937 | Railway Signaling by Wireless 1.6 MB |
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1950 | New Rail-Web Bond 1.3 MB |
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1939 | Recent Developments In Rail Bonding 3.7 MB |
1935 | Checking Rail Ends on Drawbridges 2.5 MB |
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1949 | New Space Radio Relay System Adopted by South Shore 4.2 MB |
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1944 | Railroad Applications of Electronics 1.9 MB |
1949 | A Century of Signal Glass Developments 4.2 MB |
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1943 | Herbert S. Balliet obituary 609.4 KB |
1935 | Letter to the Editor- Comment on Multiple Aspects 1.5 MB |
1911 | Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB |
1938 | CTC Replaces Staff System on the Milwaukee 2.3 MB |
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1950 | L&N Extends CTC on "EK" 10.4 MB |
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1947 | Remote Control on Baltimore & Ohio 595.8 KB |
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1954 | Automatic Gates Increase Safety 3.2 MB |
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1935 | Alining Flashers 3.2 MB |
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1947 | Annual Review and Outlook 425.1 KB |
1936 | Annunciator Circuits 2.6 MB |
1925 | Approach Locking Circuits Dependent on Signal Position 1.4 MB |
1950 | CTC on the Reading 6.6 MB |
1937 | Direct-Wire or Coded Circuits 1.3 MB |
1928 | Eliminating Danger of False-Clear Semaphores 857.8 KB |
1936 | Instructions for Crossing Protection in New York 1.8 MB |
1943 | Instructions in Signal Aspects and Indications to New Employees 5.6 MB |
1944 | Light-Type Signals Installed on the Reading 6.3 MB |
1924 | New Reading Interlocking at Camden 3.4 MB |
1934 | New Signaling on the Reading 631.4 KB |
1950 | Passenger Terminal Signals 993.8 KB |
1935 | Preventing Unnecessary Operation of Highway-Railroad Crossing Signals 4.3 MB |
1936 | Reading Installs Unique Crossing Protection 9.5 MB |
1937 | Remote Control By Code 7.0 MB |
1928 | Signal and Train Control Hearing Ends 2.0 MB |
1925 | The Train Control Situation 853.0 KB |
1926 | Train Control Progress in 1925 3.1 MB |
1944 | Light-Type Signals Installed on the Reading 6.3 MB |
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1935 | New Devices 1.5 MB |
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1937 | Rectifiers in Flood Waters 972.4 KB |
1935 | Purple Signal Glasses 3.3 MB |
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1935 | Purple Signal Glasses 3.3 MB |
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1937 | Signal Construction on the Wabash 12.2 MB |
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1944 | Railroad Applications of Electronics 1.9 MB |
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1946 | ICC 50-MPH Signal Hearing 6.9 MB |
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1935 | An Under-Voltage Relay 1.2 MB |
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1941 | Code-Following Polar Track Circuit Relay 1.4 MB |
1935 | Ground Detector Relay for Instantaneous and Automatic Detection 2.3 MB |
1936 | Light-out Relay for AC or DC 2.3 MB |
1941 | P4 Code-Following Relay 1.1 MB |
1936 | Power-Transfer Relay for Crossing Signals 3.5 MB |
1939 | 230 Routes In a Relay Interlocking 2.3 MB |
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1944 | Canadian National installs new type of all-relay interlocking at Montreal 7.0 MB |
1957 | Consolidation Cuts Costs 3.1 MB |
1954 | IC Combines Interlockings 1.5 MB |
1955 | Interlocking Expedites Terminal Moves 1.6 MB |
1954 | Loudspeakers and Interlocking Improve Yard Operation 4.7 MB |
1954 | New Interlocking on Leads to Docks Saves Time for Ore Trains 2.9 MB |
1954 | New Orleans Passenger Terminal 4.7 MB |
1954 | NYC Combines Interlockings 2.4 MB |
1957 | Relay Interlocking Saves Time at Yard Entrances 2.5 MB |
1955 | Remote Control Eliminates Train Stops 1.3 MB |
1952 | Train Time Saved By New Interlocking and Automatic Protection at 15 Street Crossings in Lima, Ohio 4.4 MB |
1950 | New Developments 16.9 MB |
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1935 | Advantages of Modern Relays 4.0 MB |
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1928 | Circuit Polarity at Relay Contacts 526.2 KB |
1935 | Circuits for Crossing Signals 1.5 MB |
1939 | Contact Pitting 1.6 MB |
1940 | D.C. Test Set For Relays, Slots 3.7 MB |
1940 | Effecting Time Delay for Relays 933.3 KB |
1936 | Flashing Light Signal Failures 2.6 MB |
1956 | Interlocking Relays 3.9 MB |
1935 | New and Unusual Signal and Relay Repair Shop on the Chicago Rapid Transit 9.0 MB |
1935 | Obsolescence in Signaling 3.4 MB |
1935 | Power Transfer Relay 1.3 MB |
1936 | Relay Shipment Container 2.0 MB |
1937 | Shunt Sensitivity and Broken Rail Protection 4.3 MB |
1937 | Track Shunting Problems 2.5 MB |
1937 | APB, Remote Control, and CTC on the Baltimore & Ohio 11.9 MB |
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1936 | C&O Remote Control 12.8 MB |
1936 | Demands for Modern Signaling 12.1 MB |
1950 | Double to Single Track with Remote Control 4.2 MB |
1936 | Interlocking and Remote Control on Erie 18.9 MB |
1935 | Obsolescence in Signaling 3.4 MB |
1937 | Pennsylvania CTC Installation 7.0 MB |
1935 | Power-Off Lights at CTC Machines 2.1 MB |
1937 | Remote Control By Code 7.0 MB |
1956 | Remote Control Converted to CTC 6.6 MB |
1941 | Remote Control Installation 2.4 MB |
1944 | Remote Control Interlocking on the D&RGW 4.3 MB |
1936 | Remote Control on the Pennsylvania 14.5 MB |
1937 | Remote Control on the Pennsylvania 5.2 MB |
1935 | Remote Control on the Seaboard 5.4 MB |
1940 | Remote Control On the Southern 3.8 MB |
1944 | Remote Control Project Saves Train Time on the Baltimore & Ohio 3.5 MB |
1931 | What Can Be Done Now? 736.8 KB |
1947 | Annual Review and Outlook 425.1 KB |
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1947 | Remote Control on Baltimore & Ohio 595.8 KB |
1956 | No Waiting for Reservations 6.3 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 |
1925 | Color-Light Signals on C&NW 6.9 MB |
1931 | Three-Track Signaling on 13.5 Miles of the C&NW 5.4 MB |
1944 | Track Circuits on Passing Tracks in CTC Territory 941.8 KB |
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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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1950 | IC Rebuilds Classification Yard 6.9 MB |
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1949 | 40-Hour Week Means More Signaling 1.1 MB |
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1913 | Flash Lights on the P&R 915.4 KB |
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1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1928 | Signal and Train Control Hearing Ends 2.0 MB |
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1947 | Annual Review and Outlook 425.1 KB |
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1924 | Three Train Control Contracts Let 1.9 MB |
1927 | Signaling of IC Chicago Terminal 6.4 MB |
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1911 | Automatic Signals on Vermillion River Bridge 986.3 KB |
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1922 | Signal Construction on the Santa Fe 797.6 KB |
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1911 | Signaling on the Illinois Traction System 1.5 MB |
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1947 | All-Relay Interlocking Replaces Mechanical Plant 1.5 MB |
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1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
1936 | Replacing Semaphores With Position Light Signals On the Norfolk & Western 7.9 MB |
1926 | Signal Business Is Good Especially For Single Track 382.3 KB |
1926 | Train Control Progress in 1925 3.1 MB |
1932 | Automatic Interlocking Replaces Mechanical Plant 1.7 MB |
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1927 | Color Light Automatic Block Signals Installed on the New York Central 3.6 MB |
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1954 | General Railway Signal Company Enters Fiftieth Year 1.6 MB |
1949 | Signal Research and Development 2.9 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1949 | 625 Miles of CTC in one Stretch 7.9 MB |
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1939 | Rock Detector Protection on the Western Pacific 2.1 MB |
1936 | Slide Detector Signals 12.9 MB |
1939 | Special Aspects for Detectors 937.0 KB |
1934 | Automatic Crossing Gates on Illinois Central 2.7 MB |
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1937 | Burlington Protects Three Crossings 6.9 MB |
1929 | Crossing Protection Installed Extensively on the Milwaukee 1.3 MB |
1934 | CTC Replaces Staff on Milwaukee 2.0 MB |
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1947 | Annual Review and Outlook 425.1 KB |
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1924 | Three Train Control Contracts Let 1.9 MB |
1947 | Signaling and Interlocking in Italy 684.8 KB |
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1930 | Color-light Automatic Block Signals and Automatic Interlocking 2.4 MB |
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1938 | EJ&E Installs APB Signaling 3.1 MB |
1949 | Milwaukee Installs Automatic Block 8.2 MB |
1935 | Signaling for Higher Train Speeds 3.0 MB |
1951 | P&WV Signals Entire Main Line 3.9 MB |
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1954 | CTC Improves Train Operation 3.3 MB |
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1943 | Crossing Protection on Milwaukee 5.7 MB |
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1927 | Rotating Stop Signal for Highway Grade Crossings 1.0 MB |
1937 | The Rotating Stop Sign 1.1 MB |
1947 | Hoosac Tunnel Interlocking and CTC 1.7 MB |
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1944 | Automatic Signaling, Train Stop, and Route Interlocking Installed in the Chicago Subways 8.6 MB |
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1952 | Chicago's Newest Subway Has Automatic Block Signaling and Train Stop 1.1 MB |
1947 | Large All-Relay Interlocking on the New York Central 2.5 MB |
1937 | New York Central Installs First Button-Control Route Interlocking 9.0 MB |
1949 | New York Central Installs Interlocking 3.3 MB |
1956 | NX Control Replaces Lever Machine 2.8 MB |
1936 | NX Electric Interlocking 3.8 MB |
1937 | Route Control Interlocking – A New Signaling Development 2.9 MB |
1940 | Route Type Interlocking at Tower Grove in St. Louis 11.1 MB |
1950 | Route Type Interlocking on New York Subway 8.7 MB |
1953 | Route Lever Interlocking on Rock Island 6.5 MB |
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1919 | Electric Interlocking at Charlottesville,VA 530.2 KB |
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1913 | Illinois Central Alternating Current Signaling 2.5 MB |
1937 | Route Locking Circuits 1.9 MB |
1911 | Summary of Recent Progress in Signaling 4.4 MB |
1944 | Rio Grande has Longest CTC 9.2 MB |
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1952 | CTC Pays Its Way on B&O 733.2 KB |
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1950 | Signaling and Rules 1.4 MB |
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1940 | A Change in the Requisites, Definitions and Regulations 1.2 MB |
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1939 | ICC Issues Rules, Standards and Instructions for Signaling 10.3 MB |
1950 | New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB |
1950 | Rules, Standards and Instructions 1.5 MB |
1950 | Telephones at Signals 1.1 MB |
1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
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1930 | Illinois Central Installs Color Light Signals on 80 Miles 1.6 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1935 | Safety of High Speed Trains 5.2 MB |
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1933 | Modern Signaling in Soviet Russia 3.3 MB |
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1941 | Automatics Installed on the Wabash 4.0 MB |
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1915 | Extension of New Haven signals 684.8 KB |
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1956 | Train Runs by Wayside Control 3.3 MB |