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.
1950 | B&O Installs All-Relay Plant 2.6 MB |
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1956 | Interlocking Consolidation: Three Into One in Baltimore 6.8 MB |
1926 | B. J Schwendt 434.3 KB |
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1950 | Obituary: B. J. Schwendt 961.7 KB |
1941 | Simplified Signaling 421.8 KB |
1952 | Speed Control Installed on the Long Island 1.3 MB |
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1937 | Signals in Advance of Switches 1.1 MB |
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1935 | Night Check of Signal Lights 1.2 MB |
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1950 | B&O Installs All-Relay Plant 2.6 MB |
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1956 | Interlocking Consolidation: Three Into One in Baltimore 6.8 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 |
1950 | Consolidation of Interlockings 2.5 MB |
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1943 | Herbert S. Balliet obituary 609.4 KB |
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1911 | New 400-Lever Interlocking Machine 3.7 MB |
1921 | Progress of Railroad Signaling in America 731.8 KB |
1931 | Automatic Interlocker Protects Gauntlet Track 1.4 MB |
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1938 | B&OCT Installs Route Interlocking 8.9 MB |
1932 | B&OCT Stops Theft of Coal with Four Automatic Plants at Chicago Heights, IL 1.9 MB |
1931 | One Electric Interlocking for Two Drawbridges 3.1 MB |
1937 | Route Control Interlocking – A New Signaling Development 2.9 MB |
1950 | B&O Installs All-Relay Plant 2.6 MB |
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1944 | Centennial of Morse Telegraph 6.6 MB |
1934 | Centralized Traffic Control Installed on the Alton 1.1 MB |
1956 | Interlocking Consolidation: Three Into One in Baltimore 6.8 MB |
1938 | Pennsylvania Electrification Signaling 5.3 MB |
1928 | Pennsylvania Installs Code System of Train Stop with Signaling 5.7 MB |
1946 | Reverse Running on the Pennsylvania 2.8 MB |
1944 | St. Louis-San Francisco Installs Centralized Traffic Control 1.1 MB |
1926 | Train Control Progress in 1925 3.1 MB |
1935 | Safety of High Speed Trains 5.2 MB |
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1913 | New Block Signaling on the North-Western 1.8 MB |
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1932 | Collision in Signal Territory 513.9 KB |
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1938 | EJ&E Installs APB Signaling 3.1 MB |
1931 | Three-Track Signaling on 13.5 Miles of the C&NW 5.4 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 |
1922 | Controlled Manual Block in Hauenstein Tunnel 3.4 MB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1935 | New Devices 1.5 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 |
1945 | CTC West of the Pecos On the Santa Fe 4.6 MB |
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1949 | The Transistor 3.1 MB |
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1920 | Electric Interlocking at Bellefontaine, Ohio 3.8 MB |
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1931 | Speed Control of Crossing Signals 586.7 KB |
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1934 | CTC Replaces Staff on Milwaukee 2.0 MB |
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1934 | CTC Replaces Staff on Milwaukee 2.0 MB |
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1941 | Belt Railway of Chicago Installs Interlocking 12.3 MB |
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1941 | Monon Changes Approved 760.8 KB |
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1941 | Belt Railway of Chicago Installs Interlocking 12.3 MB |
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1943 | Fire-Proof Construction 11.6 MB |
1958 | Interlocking Saves Time and Money for the Belt Railway of Chicago 7.1 MB |
1940 | Interlockings Installed at Two Crossings 6.5 MB |
1941 | Modern Entrance-Exit Interlocking Replaces Mechanical Plant On Indiana Harbor Belt 6.9 MB |
1957 | Relay Interlocking Saves Time at Yard Entrances 2.5 MB |
1917 | Rock Island Signaling on the Chicago Terminal 1.2 MB |
1915 | The Push Button Interlocking Plant at Clearing Yard 351.3 KB |
1942 | Wabash Installs Automatics 5.8 MB |
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1930 | Wabash Tests Automatic Train Control with Cab-Lights 3.6 MB |
1933 | Consolidated Interlockings 1.8 MB |
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1949 | New Automatic Block on the Katy 4.7 MB |
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1913 | New Signaling Across the Great Salt Lake 2.2 MB |
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1923 | Signals on the Berlin Subway and Elevated 4.7 MB |
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1930 | Pennsylvania Uses Remote Control for Switches 1.1 MB |
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1928 | Dispatcher Signaling System Operates Through Sleet Storm 1.1 MB |
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1927 | NYC First to Install Complete Train Dispatching System 8.0 MB |
1931 | Results of Centralized Control on NYC 703.8 KB |
1918 | New Electric Interlocking at Clyde, IL 418.7 KB |
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1943 | A Review of 1942 2.9 MB |
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1943 | CTC on the Bessemer & Lake Erie 8.7 MB |
1937 | Gauntlet Signals on the B&LE 7.1 MB |
1949 | New Automatic Block on the Katy 4.7 MB |
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1937 | Remote Control By Code 7.0 MB |
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1940 | New Automatic Block Signaling on the Milwaukee 6.3 MB |
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1936 | Remote Control on the Pennsylvania 14.5 MB |
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1920 | Electric Interlocking at Bellefontaine, Ohio 3.8 MB |
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1911 | Standard Outline Bill of Mechanical Material 8.7 MB |
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1926 | Directing Trains By Signals 1.9 MB |
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1911 | Automatic Signals on the Northern Pacific 6.3 MB |
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1927 | Half Interlocker on DT&I 565.6 KB |
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1933 | Train Accident on the Erie Railroad 964.9 KB |
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1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1950 | L&N Extends CTC on "EK" 10.4 MB |
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1942 | Signal Aspects During Blackouts 2.2 MB |
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1950 | CTC on the Wabash 2.6 MB |
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1921 | Absolute Permissive Block Signal System 1.2 MB |
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1915 | British and American Railroad Signaling 3.6 MB |
1911 | Signaling Practice on Steam Railways 5.5 MB |
1919 | Block Signaling Practice on a British Railway (Part 1) 294.2 KB |
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1913 | New Block Signaling on the North-Western 1.8 MB |
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1926 | Train Control Progress in 1925 3.1 MB |
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1917 | Block Signals on the Monon 669.9 KB |
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1937 | Crossing Protection on the Monon 5.0 MB |
1941 | Monon Changes Approved 760.8 KB |
1944 | Rio Grande has Longest CTC 9.2 MB |
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1950 | Bootleg Risers and Bonds 2.1 MB |
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1940 | Cadweld (Thermex) Signal Bonds 996.4 KB |
1935 | Installation of Bond Wires 1.2 MB |
1935 | Installation of Bond Wires 4.0 MB |
1920 | A Special Circuit Saves Money 394.1 KB |
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1924 | Three Train Control Contracts Let 1.9 MB |
1926 | Train Control Progress in 1925 3.1 MB |
1922 | An Old Electric Interlocking in France 1.3 MB |
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1941 | Monon Changes Approved 760.8 KB |
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1920 | East Somerville Electro-Pneumatic Plant 754.4 KB |
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1936 | Flood Damage to Signaling 5.0 MB |
1954 | NYC Combines Interlockings 2.4 MB |
1936 | Railroads Clean Up After Flood Waters 33.3 MB |
1935 | Traffic Type Signals for Protection of Highway-Railroad Crossings 2.5 MB |
1926 | Train Control Progress in 1925 3.1 MB |
1921 | New Interlocking on the Boston Elevated 3.3 MB |
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1929 | B&M Installs Either-Direction Signaling in Hoosac Tunnel 7.1 MB |
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1928 | Extensive Interlocking Changes Made by Boston & Maine 3.9 MB |
1947 | Hoosac Tunnel Interlocking and CTC 1.7 MB |
1921 | New Interlocking on the Boston Elevated 3.3 MB |
1935 | Safety of High Speed Trains 5.2 MB |
1937 | Semi-Automatic Interlockings on the Boston Elevated 3.8 MB |
1935 | Traffic Type Signals for Protection of Highway-Railroad Crossings 2.5 MB |
1950 | Neon Lighting For Crossing Gate Arms 3.1 MB |
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1922 | Signal Construction on the Santa Fe 797.6 KB |
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1940 | 11,000-Ft. Coded Track Circuits 13.6 MB |
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1935 | A Problem in Spacing Signals for Higher Train Speeds 1.6 MB |
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1935 | Braking Distance with Signals 2.4 MB |
1946 | Burlington Tests Show Signals Adequate 1.3 MB |
1935 | Multiple Aspect Signaling 3.3 MB |
1935 | Multiple-Block Signaling 7.0 MB |
1935 | New Signaling on the Route of the C&NW "400" 9.6 MB |
1941 | Rule 204 1.7 MB |
1935 | Safety of High Speed Trains 5.2 MB |
1935 | Signaling for Higher Train Speeds 3.0 MB |
1935 | Stopping Distance and Signal Spacing 1.8 MB |
1950 | Stopping Distance on Grades 3.5 MB |
1925 | Illinois Central ATS contract: News of the Month (July 1925) 700.0 KB |
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1926 | Illinois Central Continuous Train Stop Approved Without Major Exceptions 1.1 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
1938 | Train Control Petition Denied by ICC 905.5 KB |
1926 | Train Control Progress in 1925 3.1 MB |
1926 | Train Stop Without Permissive Wayside Signals Used on IC 3.5 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 |
1950 | CTC Installed on 128 Miles of NKP 12.1 MB |
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1939 | Special Aspects for Detectors 937.0 KB |
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1926 | Train Control Progress in 1925 3.1 MB |
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1947 | Southern Pacific Installs CTC 990.2 KB |
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1939 | Electric Interlocking on the New Haven 2.1 MB |
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1913 | New Haven Concrete Interlocking Towers 2.3 MB |
1913 | Illinois Central Alternating Current Signaling 2.5 MB |
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1949 | Insulation of Rails 874.8 KB |
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1929 | Spring Switches on Illinois Central 415.8 KB |
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1947 | 107 Miles of CTC on the N&W 2.3 MB |
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1929 | Frisco Installs Semaphores with Color-Light Indication 665.1 KB |
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1942 | Automatic Signal Program on the Illinois Central 4.6 MB |
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1937 | Broken Rails 1.1 MB |
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1950 | Route Type Interlocking on New York Subway 8.7 MB |
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1923 | BRT Automatic Interlocking 1.9 MB |
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1922 | Locating Automatic Block Signals for Heavy Traffic (Part 1) 3.6 MB |
1922 | Locating Automatic Block Signals for Heavy Traffic (Part 1) 4.4 MB |
1925 | Automatic Interlocking of a Double Track Junction on BMT Lines 1.8 MB |
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1935 | Automatic Interlocking on the Brooklyn-Manhattan Transit 5.4 MB |
1923 | BRT Automatic Interlocking 1.9 MB |
1949 | Signaling and Interlocking On New Line of New York Subways 6.5 MB |
1952 | Speed Control Installed on the Long Island 1.3 MB |
1947 | Railroads Request Relief from the ICC Signal Order 465.0 KB |
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1946 | More Difficult to Get a Call-On Signal 488.8 KB |
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1911 | Automatic Signals on the Chicago Great Western 7.4 MB |
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1911 | A Summary of Signaling Practice 3.6 MB |
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1931 | Efficiency Tests 1.9 MB |
1913 | New Block Signaling on the North-Western 1.8 MB |
1921 | Proposed Modification of Stop-and-Proceed Rule 1.4 MB |
1923 | Train-Order Signals at Interlockers 3.6 MB |
1935 | Highway Crossing Protection With Federal Funds 2.9 MB |
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1935 | The Federal Crossing Protection Program 1.6 MB |
1944 | Coded Track Circuits for CTC and Cab Signaling 4.0 MB |
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1937 | Rock Island Installs Automatic Blocks 10.1 MB |
1944 | Rock Island Installs Cab Signaling and Centralized Traffic Control 10.0 MB |
1946 | Rock Island Uses Carrier Equipment for Automatic OS Reports 3.9 MB |
1949 | Signaling Adapted to Traffic On the Rock Island 5.2 MB |
1950 | Personnel changes on the IC 1.4 MB |
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1925 | CB&Q Controls Switches Remotely 3.7 MB |
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1954 | This Automatic Block Is Different 3.3 MB |
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1934 | South Shore Reconstructs Interlocking 1.2 MB |
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1910 | Reconstruction of Burnside Interlocking 863.7 KB |
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1950 | CTC on the Wabash 2.6 MB |
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1913 | New Block Signaling on the North-Western 1.8 MB |
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1937 | APB, Remote Control, and CTC on the Baltimore & Ohio 11.9 MB |
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