Railway Signaling: T

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"TRAIN" indicator 1
1935 Automatic Interlockings of Two Junctions Involving Spring Switches   8.9 MB
T&NO Jct., TX 1
1954 CTC Improves Train Operation   3.3 MB
T&P Jct., TX 1
1935 Collision on the T&P   2.0 MB
T. B. Thompson 1
1950 Personal: T. B. Thompson   1.1 MB
T. George Stiles 4
1947 Drawbridge Interlocking on the Elgin, Joliet & Eastern   647.3 KB
1937 New Devices- March 1937   18.1 MB
1936 T. George Stiles Rounds Out 60 Years of Signaling   2.5 MB
1935 Test Equipment for Highway Crossing Signals   1.1 MB
table lever interlocking 1
1924 Low-Voltage Interlocking on C&NW   1.6 MB
table lever machine 1
1954 Loudspeakers and Interlocking Improve Yard Operation   4.7 MB
tail track signals 1
1949 Signaling Saves Time on Frisco   4.8 MB
Tama, IA 1
1918 Maintaining an Interlocking Plant at High Tide   241.8 KB
Tampa, FL 2
1947 Annual Review and Outlook   425.1 KB
1956 Gates at 21 Crossings   6.6 MB
Tateville, KY 1
1954 Unique Combinations of Single-Track and Two-Track Developed on the Southern   3.8 MB
Taylor Signal 1
1936 Wilmer W. Salmon, President of General Railway Signal Company, Dies   2.8 MB
Taylor, John 1
1954 General Railway Signal Company Enters Fiftieth Year   1.6 MB
Taylor, John D. 1
1921 Progress of Railroad Signaling in America   731.8 KB
Tebbets, MO 1
1943 Lap Order Results in an Accident   818.6 KB
Techny, IL 1
1933 Consolidated Interlockings   1.8 MB
telegraph 4
1944 Centennial of Morse Telegraph   6.6 MB
1956 CN Telegraph Moves Into Its New Home   8.1 MB
1944 St. Louis-San Francisco Installs Centralized Traffic Control   1.1 MB
1921 The Development of the Printing Telegraph   4.8 MB
telegraph centennial 2
1944 Centennial of Morse Telegraph   6.6 MB
1944 St. Louis-San Francisco Installs Centralized Traffic Control   1.1 MB
telephone poles 1
1949 Raising Poles   1.9 MB
telephone service 1
1950 More Communications Needed With the 40-Hour Week   1.2 MB
telephone train order signals 1
1936 Interlocking and Remote Control on Erie   18.9 MB
telephones 2
1941 Illinois Central Uses Automatic Telephone System on Chicago Terminal Area   5.8 MB
1950 Telephones at Signals   1.1 MB
teletype 1
1939 Milwaukee Utilizes Teletype   1.6 MB
Temple, TX 2
1947 Railroads Request Relief from the ICC Signal Order   465.0 KB
1922 Signal Construction on the Santa Fe   797.6 KB
Tennessee Pass 1
1929 D&RGW Expedites Trains With Centralized Control   2.1 MB
Terminal Association of St. Louis 1
1957 Consolidation Cuts Costs   3.1 MB
Terminal Island Jct. 1
1943 Pacific Electric Installs a Large All-Relay Interlocking   5.3 MB
Terminal Railroad Association of St. Louis 13
1941 All-Relay Signal System Installed on Terminal Railroad of St. Louis   1.2 MB
1956 Crossing Protection In Industrial Area   3.1 MB
1950 Crossing Protection With Indicators for Train Movements   4.5 MB
1940 Fire Destroys Tower of Large Interlocking at St. Louis   2.0 MB
1943 Fire-Proof Construction   11.6 MB
1941 Interlocking Restored to Service At St. Louis Union Station   3.6 MB
1931 New Interlocking for the St. Louis Municipal Bridge   2.9 MB
1956 NX Control Replaces Lever Machine   2.8 MB
1931 Sand Causes Signal Failure   614.1 KB
1950 Special Interlocking Controls   2.2 MB
1939 St. Louis Municipal Bridge Signaling   3.8 MB
1940 St. Louis Terminal   403.1 KB
1950 Train Signals for Highway Crossings   1.4 MB
Terminal Tower, Los Angeles, CA 1
1939 New Interlocking at Los Angeles   9.6 MB
terminals 1
1950 Modern Communications In Yards and Terminals   1.4 MB
Terre Haute, IN 5
1944 A Collision Despite Automatic Signals   2.7 MB
1929 Big Four Improves Operation by Remote Control   2.5 MB
1952 CTC Machine Hangs High But Trains Run   704.9 KB
1940 Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line   13.1 MB
1941 Protection at Hand-Thrown Switches in CTC Territory   1.6 MB
Terrminal Railroad Association of St. Louis 1
1908 Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis   7.2 MB
test equipment 1
1935 Test Equipment for Highway Crossing Signals   1.1 MB
test set 1
1939 Testing Sets   2.0 MB
testing 13
1935 Checking Signal Lamps   3.3 MB
1940 D.C. Test Set For Relays, Slots   3.7 MB
1950 DC Track Circuit Trouble   1.6 MB
1940 Hook-On Volt-Ammeter   1.3 MB
1935 New and Unusual Signal and Relay Repair Shop on the Chicago Rapid Transit   9.0 MB
1956 Signal Lamp Test   1.4 MB
1956 Signal Lamp Test   950.0 KB
1935 Test Equipment for Highway Crossing Signals   1.1 MB
1936 Testing Automatic Interlockings   3.5 MB
1940 Testing Insulated Joints   2.1 MB
1936 Testing New Interlocking   1.7 MB
1936 Testing New Interlocking   3.5 MB
1940 Testing Switches   1.1 MB
testing circuits 1
1940 Shunting Straps for Testing   890.4 KB
Texarkana, AR 2
1944 Track Circuits on Passing Tracks in CTC Territory   941.8 KB
1954 Why Cotton Belt Installed CTC On 429 Miles of Single Track   4.0 MB
Texarkana, TX 1
1954 Why Cotton Belt Installed CTC On 429 Miles of Single Track   4.0 MB
Texas 1
1911 A Comparison of the Interlocking Laws of the Various States   2.6 MB
Texas & New Orleans 9
1954 CTC Improves Train Operation   3.3 MB
1933 Graphic Recorders   843.3 KB
1937 Interlocking and Signaling For New Bridge at New Orleans   5.9 MB
1936 Maintainers' Blueprint Plans   4.2 MB
1936 New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans   7.9 MB
1935 Preventing Unnecessary Operation of Highway-Railroad Crossing Signals   4.3 MB
1936 Reconstruction of Interlocking at the Dallas Union Terminal   14.8 MB
1935 Switch-Stand Selector   1.9 MB
1935 Traffic Type Signals for Protection of Highway-Railroad Crossings   2.5 MB
Texas & Pacific 24
1935 Centralized Traffic Control on the Texas & Pacific   5.1 MB
1938 Changing Relays   1.7 MB
1935 Collision on the T&P   2.0 MB
1928 Color Light Train Order Signals Are Effective   2.9 MB
1937 Interlocking and Signaling For New Bridge at New Orleans   5.9 MB
1936 Lights Interfere With View of Signals   2.3 MB
1935 Maintainers' Tool Houses   2.2 MB
1936 New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans   7.9 MB
1954 New Orleans Passenger Terminal   4.7 MB
1935 Night Intensity of Signal Lamps   2.1 MB
1935 Pole Lines for Automatic Signaling   1.6 MB
1947 Railroads Request Relief from the ICC Signal Order   465.0 KB
1936 Reconstruction of Interlocking at the Dallas Union Terminal   14.8 MB
1930 Red Flash in Polarized-Control Signaling   811.1 KB
1928 Signal and Train Control Hearing Ends   2.0 MB
1937 Switch Protection in Automatic Territory   3.0 MB
1947 Territories Involved in the ICC Signaling Order   399.0 KB
1949 Texas & Pacific New All-Relay Interlocking   4.3 MB
1944 Track Circuits on Passing Tracks in CTC Territory   941.8 KB
1950 Two Single Tracks, Side By Side   1.4 MB
1937 Unusual Signaling Trouble   2.2 MB
1937 What is in Store for the Signal Field?   1.8 MB
1930 What Protection at Drawbridges?   3.5 MB
1928 Why Markers for Automatic Signals?   494.6 KB
Texico, NM 1
1947 Railroads Request Relief from the ICC Signal Order   465.0 KB
Texmo Jct., LA 1
1947 Railroads Request Relief from the ICC Signal Order   465.0 KB
Thackerville, TX 1
1922 Signal Construction on the Santa Fe   797.6 KB
Thalmann, GA 1
1944 Track Circuits on Passing Tracks in CTC Territory   941.8 KB
Thalmann,GA 1
1943 Centralized Traffic Control Installed On 64.6 Miles of the Seaboard   7.1 MB
Thayer, MO 1
1929 Frisco Installs Semaphores with Color-Light Indication   665.1 KB
Thebes, IL 1
1954 CTC Increases Capacity of Double Track   4.2 MB
Thirsk, England 1
1934 Re-Signaling the London North Eastern of England   3.0 MB
Thompson, T. B. 1
1953 News   2.2 MB
Thorndale, PA 2
1938 Interlocking Changes on the Pennsylvania   4.9 MB
1938 Pennsylvania Electrification Signaling   5.3 MB
Thornton, IL 1
1916 New Automatic Signals on Grand Trunk   991.7 KB
Three Forks, MT 1
1917 Light Signals On CM&StP   781.9 KB
Tidewater & Western 1
1932 An Early Automatic Interlocking   411.4 KB
Tilton, IL 1
1941 Automatics Installed on the Wabash   4.0 MB
time element relays 3
1936 Accuracy of Timing Relays   2.2 MB
1949 Controlled Overlaps for Single-Track APB Signaling   1.5 MB
1939 DC Time Element Relay   1.9 MB
time locking 4
1950 Approach Distances and Times   5.5 MB
1943 Approach or Time Locking   897.5 KB
1956 CTC Locking   2.2 MB
1943 Norfolk & Western Installs CTC on 14 Miles of Single Track   4.4 MB
time releases 1
1950 Approach Distances and Times   5.5 MB
timekeeping 1
1940 Make-Up-Time Chart   813.1 KB
timetable and train order 1
1941 A Simplified Signaling Arrangement For the Direction of Trains by Signal Indications   5.5 MB
timing 1
1940 Effecting Time Delay for Relays   933.3 KB
Tiskilwa, IL 1
1946 Rock Island Uses Carrier Equipment for Automatic OS Reports   3.9 MB
Toledo & Ohio Central 4
1933 Economics of Modern Signaling   2.1 MB
1920 Electric Interlocking at Bellefontaine, Ohio   3.8 MB
1927 NYC First to Install Complete Train Dispatching System   8.0 MB
1925 Traffic Reversal on Double Track by Signal Indication   1.5 MB
Toledo Terminal 1
1928 Pennsylvania Installs an Interlocking Without Derails   2.3 MB
Toledo, OH 4
1937 New Automatics on the C&O   5.0 MB
1957 Pushbutton CTC Machine on NYC Is First of Its Kind   3.3 MB
1956 Remote Control Converted to CTC   6.6 MB
1938 Signaling for Higher Train Speeds   3.9 MB
Tolono, IL 2
1941 Automatics Installed on the Wabash   4.0 MB
1942 Wabash Installs Automatics   5.8 MB
Tomkins, O. S. 1
1928 Changes on the C&NW   978.4 KB
Tontogany, OH 1
1932 Centralized Traffic Control on the Baltimore & Ohio   4.4 MB
tool houses 3
1935 Maintainers' Tool Houses   2.2 MB
1935 Maintainers' Tool Houses   3.5 MB
1935 Maintainers' Tool Houses   1.1 MB
Topeka, KS 3
1936 34 Train Stops Eliminated Daily by an Interlocking   10.4 MB
1941 Carrier Communication Equipment Installed on the Santa Fe   4.7 MB
1949 Signaling Adapted to Traffic On the Rock Island   5.2 MB
Toronto Terminals 5
1935 Circuits for Crossing Signals   1.5 MB
1937 False Clear Failures   2.0 MB
1931 Interlocking System Installed at Toronto Union Station   4.6 MB
1937 Signals in Advance of Switches   1.1 MB
1935 Trap Circuits at Railroad Crossings   4.6 MB
Toronto, Ontario 2
1931 Interlocking System Installed at Toronto Union Station   4.6 MB
1953 One Control Machine for Interlocked Yard Area   4.2 MB
torpedo fusee 1
1950 New Developments   16.9 MB
torpedoes 2
1937 Flag and Torpedo Containers   903.1 KB
1919 Legal Decisions on the Use of Torpedoes for Signaling Purposes   355.6 KB
Tower "U", New York, NY 1
1921 Fire Threatened Tie Up At Grand Central Terminal   1.5 MB
Tower 1, St. Louis, MO 1
1908 Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis   7.2 MB
Tower 2, St. Louis, MO 1
1908 Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis   7.2 MB
Tower 3, St. Louis, MO 1
1908 Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis   7.2 MB
Tower A, Omaha, NE 1
1931 Three Large Interlockings Installed by Union Pacific at Omaha   6.2 MB
Tower A-3, Chicago, IL 1
1958 CTC Handles 15 More Trains   1.9 MB
Tower B, Omaha, NE 1
1931 Three Large Interlockings Installed by Union Pacific at Omaha   6.2 MB
Tower B-12, Franklin Park, IL 1
1958 CTC Handles 15 More Trains   1.9 MB
Tower B-17, Bensenville, IL 1
1958 CTC Handles 15 More Trains   1.9 MB
Tower B-35, Elgin, IL 1
1958 CTC Handles 15 More Trains   1.9 MB
Tower C, Omaha, NE 1
1931 Three Large Interlockings Installed by Union Pacific at Omaha   6.2 MB
Tower Grove, MO 1
1940 Route Type Interlocking at Tower Grove in St. Louis   11.1 MB
Tower NY, IL 1
1931 Three-Track Signaling on 13.5 Miles of the C&NW   5.4 MB
towers 2
1911 Interlocking on the North Western Terminal   7.6 MB
1911 Signaling and Interlocking on the North Western Terminal in Chicago   1.1 MB
track circuits 25
1935 An Improved Track Circuit for Light-Weight Equipment   2.4 MB
1923 Automatics on Paris Grande Ceinture   5.0 MB
1919 Block Signaling Practice on a British Railway (Part 2)   475.1 KB
1939 Checking Track Circuits From a Motor Car   837.6 KB
1950 DC Track Circuit Trouble   1.6 MB
1935 DC Track Circuits   963.2 KB
1956 How to Control Signals Safely Where Lightweight Trains are Operated   8.4 MB
1949 Insulation of Rails   874.8 KB
1944 Necessities or Frills in Centralized Traffic Control   1.0 MB
1943 Progress in the Use of Coded Track Circuits   1.6 MB
1921 Progress of Railroad Signaling in America   731.8 KB
1956 Release of Locking   3.7 MB
1935 Respacing Automatics on the Pennsylvania   1.8 MB
1935 Safety of High Speed Trains   5.2 MB
1929 Scientific Research on Track Circuits   844.6 KB
1927 Should Track Circuit Polarities Be Staggered   427.4 KB
1927 Should Track Circuit Polarities be Staggered?   1.5 MB
1937 Shunt Sensitivity and Broken Rail Protection   4.3 MB
1940 Testing Insulated Joints   2.1 MB
1931 The AC DC Track Circuit   1.5 MB
1943 Track Circuit Numbers   2.2 MB
1944 Track Circuits on Passing Tracks in CTC Territory   941.8 KB
1937 Track Shunting Problems   947.3 KB
1937 Track Shunting Problems   2.5 MB
1949 Train Operation By Signal Inidication Used Extensively on the Nickel Plate   6.1 MB
track instrument 1
1937 New Devices- March 1937   18.1 MB
track occupancy detection 1
1937 Track Occupancy Indications in CTC Territory   2.7 MB
track relays 1
1939 Track Relay Release Time   1.6 MB
Tracy, CA 1
1926 Train Control Progress in 1925   3.1 MB
traffic control system 2
1950 New Rules, Standards and Instructions Issued by the Interstate Commerce Commission   7.9 MB
1950 Rules, Standards and Instructions   1.5 MB
traffic locking 3
1921 A New Idea in Traffic Locking On the C&O   1.7 MB
1950 CTC on the Reading   6.6 MB
1950 Two Single Tracks, Side By Side   1.4 MB
traffic signals 2
1936 Street Traffic Signals Controlled by Trains   5.1 MB
1935 Traffic Type Signals for Protection of Highway-Railroad Crossings   2.5 MB
train communication 1
1950 Continuity of Train Communication   2.6 MB
train control 26
1925 A. H. Rudd Discusses Train Control at Philadelphia Engineers' Club   2.8 MB
1922 Automatic Train Control Hearing Is Concluded at Washington   12.1 MB
1931 Automatic Train Control on Great Western of England   1.7 MB
1931 British Report on Automatic Train Control   2.6 MB
1925 Division Train Control Installation on C&EI Approved by ICC   2.9 MB
1925 Final Train Control Order Issued by ICC   4.1 MB
1922 Four Recent Train Control Studies   7.9 MB
1946 ICC 50-MPH Signal Hearing   6.9 MB
1946 ICC Signal Hearing   1.3 MB
1946 ICC Signaling Investigation   770.4 KB
1925 News of the Month (July 1925)   680.1 KB
1926 Open Switch Protection in Train Control Installations   451.3 KB
1925 Preliminary Report on C&NW Train Control   929.6 KB
1925 Reports of Three Interim Inspections   1.4 MB
1929 Simplification of Apparatus Will Expand Usefulness of Signaling   1.3 MB
1922 Some Points to Consider in Selection of Train Control   22.6 MB
1953 The North Western Installs Automatic Train-Stop System   3.5 MB
1927 The Public Is Interested in Signaling   444.4 KB
1925 The Train Control Situation   853.0 KB
1929 The Year 1928 in Retrospect and the Outlook for 1929   1.5 MB
1922 Train Control Approved by the British   7.0 MB
1925 Train Control Inspection Reports   1.7 MB
1925 Train Control Progress in 1924   3.8 MB
1926 Train Control Progress in 1925   3.1 MB
1929 What Is the Future of Train Control?   1.8 MB
1928 What Is to Be Gained by Train Stop or Train Control?   463.8 KB
train control order 3
1923 News of the Month (July 1923)   1.9 MB
1923 News of the Month (November 1923)   1.8 MB
1923 News of the Month (October 1923)   1.9 MB
train describer 2
1939 San Francisco-Oakland Bay Bridge Interlocking Plants   9.4 MB
1939 San Francisco-Oakland Bay Bridge Signaling and Interlocking   7.9 MB
train dispatching 3
1921 A Complete Train Despatching System   1.7 MB
1950 Centralized Train Dispatching   1.4 MB
1911 Train Dispatching on Interurban Railways   2.0 MB
train identification 1
1954 Junction Controlled Automatically   2.5 MB
train indicators 1
1949 Train Indicator for Motor Car   1.0 MB
train order fork 1
1950 Illuminated Train Order Fork   1.1 MB
train order lamp 1
1937 New Devices- March 1937   18.1 MB
train order operation 1
1935 Collision on the Erie   2.2 MB
train order signaling 1
1946 The User of Signaling   894.7 KB
train order signals 6
1937 Approach Indications to Train Order Signals   4.2 MB
1950 Flashing Signal Aspects   1.1 MB
1939 Light Signals as Train-Order Signals   918.5 KB
1937 Should Train Order Signals Control Automatic Signals   1.2 MB
1928 Train Order Indicators Used Successfully on the CI&L   604.3 KB
1940 Train Order Signals   4.2 MB
train orders 12
1954 CTC into Service   2.5 MB
1925 Eliminating the Written Train Order   2.8 MB
1946 ICC 50-MPH Signal Hearing   6.9 MB
1950 Illuminated Train Order Fork   1.1 MB
1925 Signaling at the Age of Maturity   2.0 MB
1937 Special Locking Release   2.4 MB
1939 Speeding Up Train Operation With Signaling   4.5 MB
1923 Superintendents Discuss Form "19"   2.0 MB
1920 The Use of Signals for Better Train Operation (Part 1 of 2)   5.7 MB
1920 The Use of Signals for Better Train Operation (Part 2 of 2)   7.3 MB
1911 Train Dispatching on Interurban Railways   2.0 MB
1954 Train Operations When CTC Fails   2.0 MB
train radio 2
1950 Increase In Train Communication Systems   2.4 MB
1950 Modern Communications In Yards and Terminals   1.4 MB
train sign 1
1920 A Train Sign Used As an Indicator   267.5 KB
train speeds 1
1937 Report of Committee X – Signaling Practice   2.9 MB
train staff 1
1922 A Rolling Pin as a Positive Staff   503.7 KB
train stops 2
1944 Automatic Signaling, Train Stop, and Route Interlocking Installed in the Chicago Subways   8.6 MB
1940 Interlocking on the Hudson & Manhattan   6.8 MB
train telephone communication 1
1944 Train Telephone Communication   4.1 MB
train telephones 2
1937 Rocket Train Telephones   5.7 MB
1937 Zephyr Train Telephones   2.3 MB
training 2
1921 Educational Meetings On the Illinois Central   616.5 KB
1956 Training Program   2.1 MB
transformers 2
1950 New Developments   16.9 MB
1935 New Devices   1.5 MB
transistors 1
1949 The Transistor   3.1 MB
trap circuits 3
1950 Bootleg Risers and Bonds   2.1 MB
1940 Trap Circuit   872.0 KB
1935 Trap Circuits at Railroad Crossings   4.6 MB
Trenton, MO 2
1932 CRI&P Extends Centralized Control   2.6 MB
1945 The New Connections at Kansas City For Milwaukee and Rock Island   4.7 MB
Trenton, NJ 5
1946 Carryphone on the Pennsylvania   1.5 MB
1937 New Signaling on Pennsylvania   1.0 MB
1931 Signaling for Electrified Operation   3.5 MB
1933 Signaling on the Pennsylvania's Electrified Line   3.6 MB
1915 Trenton Electro-Mechanical Interlocking   1.7 MB
Trinidad, CO 1
1947 Railroads Request Relief from the ICC Signal Order   465.0 KB
triple underpass, Dallas, TX 1
1936 Reconstruction of Interlocking at the Dallas Union Terminal   14.8 MB
Trissal, J. M. 1
1950 Personnel changes on the IC   1.4 MB
Trois Rivieres, Quebec 1
1931 Economy of Smaller Towers   539.7 KB
Troost Avenue, Kansas City, MO 1
1949 Entrance-Exit Interlocking Installed on Missouri Pacific   3.0 MB
Troy, NY 2
1929 B&M Installs Either-Direction Signaling in Hoosac Tunnel   7.1 MB
1947 Hoosac Tunnel Interlocking and CTC   1.7 MB
Truckee, CA 1
1911 The Staff System on the Southern Pacific   4.0 MB
Tuckahoe, WV 1
1936 Centralized Traffic Control on the Chesapeake & Ohio   4.3 MB
Tucson, AZ 1
1954 SP Modernizes Automatic Block   2.0 MB
Tucumcari, NM 1
1938 Adapting Signaling to Requirements   1.7 MB
Tulsa, OK 2
1929 Frisco Installs Semaphores with Color-Light Indication   665.1 KB
1947 Railroads Request Relief from the ICC Signal Order   465.0 KB
tunnels 1
1956 Union Pacific Installs Protection For Motor Cars at Tunnels   3.2 MB
turnouts 1
1939 Track Turnouts and Signal Aspects   1.8 MB
Tuscola, IL 1
1925 Illinois Central ATS contract: News of the Month (July 1925)   700.0 KB
Two Harbors, MN 1
1944 CTC Speeds Ore Traffic On the DM&IR   4.6 MB
two-position signaling 1
1940 Southern Pacific Petition Denied   3.0 MB
Tyler, TX 1
1954 Why Cotton Belt Installed CTC On 429 Miles of Single Track   4.0 MB
Type D signals 1
1935 New Signaling on the Route of the C&NW "400"   9.6 MB
Type E signals 3
1925 Color-Light Signals on C&NW   6.9 MB
1935 New Signaling on the Route of the C&NW "400"   9.6 MB
1931 Three-Track Signaling on 13.5 Miles of the C&NW   5.4 MB
Type SA searchlight signal 1
1937 New Devices- March 1937   18.1 MB
Type SA signals 1
1935 New Signaling on the Route of the C&NW "400"   9.6 MB
Type SC signals 1
1940 New Searchlight Signal   2.7 MB
Tyrone Forge, PA 1
1926 Directing Trains By Signals   1.9 MB
Tyrone, PA 1
1947 CTC Saves Train Time on the Pennsylvania   1.5 MB

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