Railway Signaling: I

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.

Learn more about this collection.

Iles, IL 3

1961	News Briefs. 1961-05 1.1 MB
1962	News Briefs. 1962-02 1.4 MB
1962	News Briefs. 1962-08 685.4 KB

Illinois 2

1936	$500,000 Crossing Protection Program of Illinois 17.5 MB
1911	A Comparison of the Interlocking Laws of the Various States 2.6 MB

Illinois Central 139

1932	A Call-On Signal Is Different from a Stop and Proceed Signal 667.6 KB
1939	A Message of Confidence 741.8 KB
1949	A Mile-Stone In Signaling 1.2 MB
1949	A. A. Freiberger 827.1 KB
1934	Accident at Crossing 491.3 KB
1941	Accident at Interlocking 1.3 MB
1938	Accident Involving Rule 93 1.5 MB
1946	All-Relay Interlocking on IC 3.0 MB
1940	ATC Tests Ordered 676.8 KB
1934	Automatic Crossing Gates on Illinois Central 2.7 MB
1939	Automatic Gates on the Illinois Central 3.3 MB
1928	Automatic Interlocker on Chicago Great Western Effects Saving 2.4 MB
1933	Automatic Interlocking in Train Control Territory 2.3 MB
1942	Automatic Signal Program on the Illinois Central 4.6 MB
1928	C&EI Installs Automatic Interlocker at Main Line Crossing 3.7 MB
1927	Can Cab Signaling Be Relied Upon Exclusively? 989.8 KB
1956	Centralia Has Protection of All Crossings 6.7 MB
1928	Changes on the C&NW 978.4 KB
1956	Conelrad – A Civil Defense Measure … How Some Railroads are Participating 4.1 MB
1928	Continued Activity and Development in Signaling 1.1 MB
1949	Controlled Overlaps for Single-Track APB Signaling 1.5 MB
1928	Cost of a Train Stop 944.9 KB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1936	Demands for Modern Signaling 12.1 MB
1926	Directing Trains By Signals 1.9 MB
1952	Double-Track CTC on Illinois Central 759.7 KB
1910	Drafting Room Practice in the Signal Department 1.3 MB
1921	Educational Meetings On the Illinois Central 616.5 KB
1910	Electric Drawbridge Interlocking 1.2 MB
1915	Electric Interlocking at Aulon, Tennessee 882.6 KB
1943	Electric Interlocking Installed On IC 12.8 MB
1926	Electro-Pneumatic Car Retarders in Service on Illinois Central 3.8 MB
1928	Emergency Release Circuits 2.4 MB
1915	Emergency Suburban Traffic 252.9 KB
1947	False Clear Signal 1.0 MB
1950	Flashing Signal Aspects 1.1 MB
1941	Flashing Yellow as a Fourth Aspect on the IC 2.6 MB
1911	General News (August 1911) 559.3 KB
1954	IC Combines Interlockings 1.5 MB
1953	IC Installs Automatic Block 4.0 MB
1925	IC Markham contracts: News of the Month (June 1925) 579.3 KB
1961	IC Puts CTC Through Swamp 1.6 MB
1950	IC Rebuilds Classification Yard 6.9 MB
1947	ICC Signal Hearings 179.7 KB
1913	Illinois Central Alternating Current Signaling 2.5 MB
1939	Illinois Central Application Denied 854.7 KB
1925	Illinois Central ATS contract: News of the Month (July 1925) 700.0 KB
1926	Illinois Central Continuous Train Stop Approved Without Major Exceptions 1.1 MB
1947	Illinois Central Honors Radio “Hams” for Emergency Services 278.0 KB
1932	Illinois Central Installs 68-Lever Electric Plant 3.3 MB
1930	Illinois Central Installs Color Light Signals on 80 Miles 1.6 MB
1952	Illinois Central Installs Modern Protection at Crossings in Memphis, TN 1.3 MB
1940	Illinois Central Order 1.3 MB
1937	Illinois Central Petitions to Remove Train Control 1.6 MB
1941	Illinois Central Uses Automatic Telephone System on Chicago Terminal Area 5.8 MB
1930	Interlockers Replaced by Centralized Traffic Control on the Illinois Central 1.8 MB
1937	Interlocking and Signaling For New Bridge at New Orleans 5.9 MB
1956	Interlocking Relays 3.9 MB
1956	Length of Train Selects Control of Crossing Gates on Illinois Central 4.6 MB
1925	Light Signals, Color, Position, or Color-Position 1.5 MB
1933	Lock Releasing 469.9 KB
1965	Midwest RRs fight the weather 914.3 KB
1920	Modern Telegraph Office at Indianapolis 3.1 MB
1951	More Signal Construction in 1950 1.0 MB
1955	Much is new in signaling for 1955 826.7 KB
1936	New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans 7.9 MB
1918	New Electric Interlocking at Clyde, IL 418.7 KB
1954	New Orleans Passenger Terminal 4.7 MB
1953	News 2.2 MB
1955	News Briefs. 1955-08 801.6 KB
1961	News Briefs. 1961-06 718.3 KB
1961	News Briefs. 1961-11 1.3 MB
1961	News Briefs. 1961-12 971.1 KB
1962	News Briefs. 1962-02 1.4 MB
1962	News Briefs. 1962-03 1.1 MB
1962	News Briefs. 1962-04 1.2 MB
1962	News Briefs. 1962-06 980.1 KB
1962	News Briefs. 1962-07 509.0 KB
1962	News Briefs. 1962-10 457.3 KB
1962	News Briefs. 1962-11 473.4 KB
1962	News Briefs. 1962-12 481.7 KB
1963	News Briefs. 1963-01 971.6 KB
1963	News Briefs. 1963-02 1.3 MB
1963	News Briefs. 1963-03 830.1 KB
1963	News Briefs. 1963-05 742.2 KB
1963	News Briefs. 1963-11 1.4 MB
1964	News Briefs. 1964-02 997.7 KB
1964	News Briefs. 1964-05 1.0 MB
1964	News Briefs. 1964-06 820.5 KB
1964	News Briefs. 1964-10 778.4 KB
1965	News Briefs. 1965-01 2.0 MB
1923	News of the Month (July 1923) 1.9 MB
1923	News of the Month (November 1923) 1.8 MB
1935	Night Check of Signal Lights 1.2 MB
1938	Non-Stop Permissive Automatic Signals 1.4 MB
1941	Non-Stop Permissive Signals 2.8 MB
1937	Ohio Flood Damages Signaling 9.7 MB
1941	P. M. Gault obituary 1.2 MB
1940	Panama Limited Collides With Louisiane 1.0 MB
1950	Personal: T. B. Thompson 1.1 MB
1950	Personnel changes on the IC 1.4 MB
1926	Phantom Signaling an Innovation 356.2 KB
1931	Preparation of Signal Circuit Plans 2.0 MB
1944	Railroad Applications of Electronics 1.9 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1910	Reconstruction of Burnside Interlocking 863.7 KB
1918	Record Snowstorms Paralyze Transportation 424.7 KB
1926	Recurrent Acknowledgment at Stop Signals 961.9 KB
1930	Report of Committee I – Economics of Signaling 2.5 MB
1937	Report of Committee X – Signaling Practice 2.9 MB
1929	Report on IC Derailment at Interlocking Plant 647.6 KB
1908	Reporting System of the Illinois Central Railroad 1.3 MB
1917	Rock Island Signaling on the Chicago Terminal 1.2 MB
1926	Semaphore or Light Signals? 1.8 MB
1926	Semaphores Replaced By Color Light Signals on 55 Miles of IC 1.3 MB
1928	Signal and Train Control Hearing Ends 2.0 MB
1930	Signal Indications Direct Trains on the Paducah & Illinois 5.0 MB
1923	Signaling Increases Capacity of Three Tracks 7.3 MB
1927	Signaling of IC Chicago Terminal 6.4 MB
1925	Signaling Two Tracks to Capacity 2.8 MB
1936	Signals Installed at 26 Crossings in Dubuque, IA 13.8 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1910	Supplemental Notes on Drafting Practice 382.8 KB
1961	Survey Tells How Railroads Use Hotbox Detectors 1.8 MB
1947	Territories Involved in the ICC Signaling Order 399.0 KB
1936	Testing New Interlocking 3.5 MB
1956	The Crossing Accident Problem 986.5 KB
1925	The Train Control Situation 853.0 KB
1938	Train Control Petition Denied by ICC 905.5 KB
1926	Train Control Progress in 1925 3.1 MB
1927	Train Operation Without Written Train Orders 3.3 MB
1926	Train Stop Without Permissive Wayside Signals Used on IC 3.5 MB
1940	Two Accidents on the Illinois Central 2.8 MB
1927	Various Circuits for Directional Control of Single Track Signals 2.6 MB
1930	W. M. Vandersluis 550.2 KB
1937	Warning Time With Crossing Gates 1.3 MB
1928	What Is the Cost of a Train Stop? 463.2 KB
1931	Why Not Eliminate Train Stops at Permissive Wayside Signals 763.1 KB
1945	William H. Claus (promotion) 425.7 KB

Illinois Commerce Commission 2

1936	$500,000 Crossing Protection Program of Illinois 17.5 MB
1936	Semaphore Type Crossing Gate Developed on the Alton 8.3 MB

Illinois Crossing and Drawbridge Act 1

1910	Interlocking Laws in the United States and Canada 821.1 KB

Illinois legislature 1

1910	Interlocking Laws in the United States and Canada 821.1 KB

Illinois Northern 1

1917	New Plant in Chicago Terminal District 591.7 KB

Illinois Railroad & Warehouse Commission 1

1910	Interlocking Laws in the United States and Canada 821.1 KB

Illinois Terminal 2

1933	Signaling of New Terminal 1.6 MB
1947	Territories Involved in the ICC Signaling Order 399.0 KB

Illinois Traction System 3

1911	Automatic Signals on Vermillion River Bridge 986.3 KB
1911	Signaling on the Illinois Traction System 1.5 MB
1913	The Union’s Signaling Exhibition Room 1.5 MB

Illmo, MO 4

1941	Signaling on 47 Miles of St. Louis Southwestern 12.6 MB
1944	St. Louis Southwestern Installs Centralized Traffic Control 6.9 MB
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

illuminated track diagram 1

1952	Interlockings Modernized at Three Railroad Crossings 974.7 KB

illumination 1

1937	Illumination as a Type of Crossing Protection 3.0 MB

impedence bond 1

1965	AFO circuits can be used in subways 682.4 KB

Independent Subway System 2

1940	Signal Lens Cleaner 1.1 MB
1934	Signaling of the New York Subways 3.9 MB

index 40

1908	1908-1909 index 1.1 MB
1909	1909-1910 index 741.2 KB
1910	1910 index 737.1 KB
1911	1911 index 1.1 MB
1912	1912 index 1.6 MB
1913	1913 index 942.3 KB
1914	1914 index 809.5 KB
1915	1915 index 6.6 MB
1916	1916 index 9.4 MB
1917	1917 index 8.1 MB
1920	1920 index 7.5 MB
1929	1929 index 7.4 MB
1931	1931 index 6.6 MB
1932	1932 index 4.7 MB
1933	1933 index 4.4 MB
1934	1934 index 4.9 MB
1935	1935 index 4.5 MB
1936	1936 index 4.0 MB
1937	1937 index 4.8 MB
1938	1938 index 4.0 MB
1939	1939 index 3.8 MB
1940	1940 index 3.9 MB
1941	1941 index 3.7 MB
1942	1942 index 3.7 MB
1943	1943 index 3.9 MB
1944	1944 index 3.6 MB
1951	1951 index 4.8 MB
1952	1952 index 5.2 MB
1953	1953 index 4.7 MB
1954	1954 index 2.5 MB
1955	1955 index 2.6 MB
1956	1956 index 2.8 MB
1957	1957 index 2.9 MB
1958	1958 index 2.8 MB
1959	1959 index 2.9 MB
1960	1960 index 2.8 MB
1961	1961 index 2.7 MB
1962	1962 index 273.6 KB
1963	1963 index 292.5 KB
1964	1964 index 334.4 KB

India 1

1961	What’s the Answer? 1961-04 960.3 KB

Indian Head, Saskatchewan 2

1961	News Briefs. 1961-04 1.5 MB
1962	News Briefs. 1962-05 831.1 KB

Indian Hill, IL 2

1941	Automatics Installed on North Shore 1.6 MB
1935	The "400" to Run on Six and One Half Hour Schedule 942.0 KB

Indiana 1

1911	A Comparison of the Interlocking Laws of the Various States 2.6 MB

Indiana Habor Belt 1

1947	Highway Crossing Protection Installed by Several Railroads in Gary, IndianaR 1.2 MB

Indiana Harbor Belt 6

1949	A Mile-Stone In Signaling 1.2 MB
1928	Electric Interlocker and Switch Control Speeds Up Yard Operation 2.4 MB
1927	Indiana Harbor Belt Rebuilds Flat Yard Into Hump Layout Providing Retarders and Power Switches 2.9 MB
1941	Modern Entrance-Exit Interlocking Replaces Mechanical Plant On Indiana Harbor Belt 6.9 MB
1965	News Briefs. 1965-07 793.4 KB
1939	Speeding Up Train Operation With Signaling 4.5 MB

Indiana Harbor, IN 1

1923	News of the Month (October 1923) 1.9 MB

Indianapolis Union 3

1931	Indianapolis Union Station Installs Electro-Pneumatic Interlocking 4.7 MB
1920	Modern Telegraph Office at Indianapolis 3.1 MB
1938	Signaling and Interlocking On the Indianapolis Union Railway 4.7 MB

Indianapolis, IN 8

1932	A Detector Bar Fails 1.5 MB
1942	Chicago, Indianapolis & Louisiville Modernizes Automatic Signaling 3.9 MB
1932	Detector Bars in 1932 419.4 KB
1931	Indianapolis Union Station Installs Electro-Pneumatic Interlocking 4.7 MB
1920	Modern Telegraph Office at Indianapolis 3.1 MB
1965	News Briefs. 1965-01 2.0 MB
1938	Signaling and Interlocking On the Indianapolis Union Railway 4.7 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Indianola, NE 1

1925	Train Operation by Signal Indication on Burlington for 14 Years 679.2 KB

Indiantown, FL 1

1963	News Briefs. 1963-11 1.4 MB

indication codes 1

1950	CTC Indication Code 1.2 MB

indication locking 3

1965	Indication locking inadequate says ICC in report 844.7 KB
1935	Repeating Reverse Signal Indication 2.9 MB
1929	Simplification of Apparatus Will Expand Usefulness of Signaling 1.3 MB

Indio, CA 2

1950	CTC on Sunset Route 3.1 MB
1945	Southern Pacific Installs CTC on 72 Miles of Single Track 5.6 MB

Indo, CA 1

1962	Automatic Dispatching 2.1 MB

Indo, IN 1

1965	News Briefs. 1965-06 1.2 MB

inductive train communication 5

1950	Continuity of Train Communication 2.6 MB
1950	Increase In Train Communication Systems 2.4 MB
1944	Inductive Train Communication 3.9 MB
1947	Medals Awarded by Franklin Institute 236.3 KB
1950	Modern Communications In Yards and Terminals 1.4 MB

industrial switching 1

1955	Yard radio pays its way on the C&O 799.6 KB

infrared hotbox detection 1

1962	Toronto Railway Conference – Automatic Train Operation 457.7 KB

infrared hotbox detector 1

1962	Hotbox Detectors Talk 2.0 MB

Inman Yard, Howell, GA 1

1950	Double to Single Track with Remote Control 4.2 MB

inspections 2

1937	Inspection of Signal Facilities 2.1 MB
1935	X-Rays in the Signal Industry 5.8 MB

Institute of Electrical and Electronics Engineers 1

1963	Automated Rail Transit Discussed by IEEE-ASME 315.3 KB

Institution of Railway Signal Engineers 3

1929	Institution of Signal Engineers Meets in Holland 1.5 MB
1923	News of the Month (November 1923) 1.8 MB
1964	Train Describers: A step toward ATI 2.1 MB

instrument cases 1

1950	Instrument Case Platforms 3.7 MB

insulated joints 5

1949	Insulation of Rails 874.8 KB
1920	Relation of Insulated Joint to Track Circuit 2.5 MB
1940	Testing Insulated Joints 2.1 MB
1939	Unusual Signal Trouble 891.9 KB
1939	Unusual Signal Trouble 1.6 MB

insulators 2

1932	Insulators 371.1 KB
1940	Southern Pacific Washes Insulators 1.5 MB

Integra 1

1962	Control Panels 243.4 KB

Interborough Rapid Transit 7

1924	Drafting Practice on Interborough 2.9 MB
1928	Emergency Release Circuits 2.4 MB
1916	Methods of Locating Automatic Signals 428.3 KB
1928	More Comments on Latch Locking 643.4 KB
1924	New York Commission Recalls Order 3.3 MB
1917	New York Elevated Signal Improvements 418.8 KB
1909	Solenoid Signals 2.1 MB

Intercolonial 1

1915	Victoria Jubilee Bridge Protection 570.0 KB

Interlocking 1

1954	Loudspeakers and Interlocking Improve Yard Operation 4.7 MB

interlocking 349

1962	1962 outlook 3.0 MB
1939	230 Routes In a Relay Interlocking 2.3 MB
1936	34 Train Stops Eliminated Daily by an Interlocking 10.4 MB
1940	A Change in the Requisites, Definitions and Regulations 1.2 MB
1915	A Half-Interlocking Plant on the Canadian Northern 1.6 MB
1945	A Most Complicated Automatic Interlocking 2.6 MB
1916	A New York Central Plant in Chicago 590.7 KB
1919	A Peculiar Accident 251.7 KB
1941	A Review of 1940 and Prospects for the Future 1.3 MB
1943	A Review of 1942 2.9 MB
1920	A Special Circuit Saves Money 394.1 KB
1916	AC Signaling for Chicago Terminals 585.7 KB
1935	Accident at Automatic Plant 4.5 MB
1921	Accident on Porter, Indiana Interlocking Plant 1.1 MB
1956	Air Line Leak 1.1 MB
1914	All Electric Interlocking at Joliet 1.5 MB
1948	All-Relay Interlocking on New Haven 1.2 MB
1936	All-Relay Interlocking On NYC at Syracuse 29.7 MB
1943	All-Relay Interlocking Replaces Mechanical Plant 9.3 MB
1947	All-Relay Interlocking Replaces Mechanical Plant 1.5 MB
1947	All-Relay Interlockings On the RF&P 1.3 MB
1941	All-Relay Signal System Installed on Terminal Railroad of St. Louis 1.2 MB
1934	An Electric Interlocking on the Southern Pacific 1.8 MB
1922	An Old Electric Interlocking in France 1.3 MB
1947	Annual Review and Outlook 425.1 KB
1936	Annunciator Circuits 2.6 MB
1937	APB, Remote Control, and CTC on the Baltimore & Ohio 11.9 MB
1950	Approach Distances and Times 5.5 MB
1937	Approach Locking on Dwarf Signals 1.2 MB
1943	Approach or Time Locking 897.5 KB
1955	At Portland Terminal, combined interlocking 810.6 KB
1939	Automatic Cut-Outs at an Automatic Interlocking 7.6 MB
1924	Automatic Interlocker for a Crossing 3.4 MB
1935	Automatic Interlocking Involves Highway Crossing Signals 3.4 MB
1935	Automatic Interlocking on the Brooklyn-Manhattan Transit 5.4 MB
1935	Automatic Interlocking on the Philadelphia Elevated 6.1 MB
1935	Automatic Interlocking on the Wabash 2.9 MB
1932	Automatic Interlocking Protects End of Double Track 2.7 MB
1935	Automatic Interlockings of Two Junctions Involving Spring Switches 8.9 MB
1937	Automatic Plant Replaces Mechanical Interlocking 1.3 MB
1944	Automatic Signaling, Train Stop, and Route Interlocking Installed in the Chicago Subways 8.6 MB
1911	Automatic Signals on the Chicago Great Western 7.4 MB
1911	Automatic Signals on the Northern Pacific 7.2 MB
1911	Automatic Signals on the Northern Pacific 6.3 MB
1950	B&O Installs All-Relay Plant 2.6 MB
1951	B&O Installs Modern Interlocking 871.3 KB
1941	Belt Railway of Chicago Installs Interlocking 12.3 MB
1950	Big NX Interlocking at Atlanta 6.3 MB
1915	British and American Railroad Signaling 3.6 MB
1923	BRT Automatic Interlocking 1.9 MB
1956	Burlington Has Compact Control Machine for Consolidation of 14 Interlockings 11.3 MB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1929	C&EI Derailment and Collision at Chicago 755.9 KB
1936	C&O Remote Control 12.8 MB
1943	Canadian National Installs a Large All-Relay Electric Interlocking 8.8 MB
1944	Canadian National installs new type of all-relay interlocking at Montreal 7.0 MB
1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB
1944	Canadian Pacific Installs Centralized Traffic Control 4.4 MB
1933	Centralized Traffic Control and Remote Control 575.8 KB
1943	Centralized Traffic Control Installed On 64.6 Miles of the Seaboard 7.1 MB
1935	Centralized Traffic Control Installed on the Pittsburgh & Lake Erie 12.9 MB
1943	Centralized Traffic Control on the Milwaukee 2.8 MB
1928	Changes in Types of Interlocking 443.4 KB
1935	Checking Rail Ends on Drawbridges 2.5 MB
1953	Chicago & Western Indiana Installs Easily Manipulated Interlocking 8.1 MB
1947	Choice of Interlocking Control Machines 266.5 KB
1949	Coast Line Replaces Signaling On Engine District 8.1 MB
1950	Consolidated Control of Interlockings 1.3 MB
1957	Consolidation Cuts Costs 3.1 MB
1950	Consolidation of Interlockings 2.5 MB
1962	Control Panels 243.4 KB
1961	Corrections for “Underwater Interlocking” Circuits 218.9 KB
1932	Crossing Problem 2.6 MB
1936	Crossing Protection Includes Signals for Directing Trains 17.0 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1955	CTC enables P&LE to remove fourth main track 515.3 KB
1954	CTC Improves Train Operation 3.3 MB
1955	CTC on single and double track 406.8 KB
1950	CTC on the Reading 6.6 MB
1955	CTC reduces operating expenses 431.8 KB
1944	CTC Speeds Ore Traffic On the DM&IR 4.6 MB
1937	Delaware River Bridge Signaling 13.9 MB
1936	Demands for Modern Signaling 12.1 MB
1935	Depression Operation of Interlocking 2.6 MB
1934	Desk-Lever Interlocking Installed on Canadian National 1.2 MB
1932	Detector Bars in 1932 419.4 KB
1937	Direct-Wire or Coded Circuits 1.3 MB
1924	Drafting Practice on Interborough 2.9 MB
1910	Drafting Room Practice in the Signal Department 1.3 MB
1915	Duluth Terminal Trestle Signaling 2.3 MB
1961	Dynamic Indication 254.1 KB
1920	East Somerville Electro-Pneumatic Plant 754.4 KB
1910	Electric Drawbridge Interlocking 1.2 MB
1915	Electric Interlocking at Aulon, Tennessee 882.6 KB
1920	Electric Interlocking at Bellefontaine, Ohio 3.8 MB
1909	Electric interlocking at C St. and Delaware Ave., Washington, DC 1.4 MB
1919	Electric Interlocking at Charlottesville,VA 530.2 KB
1915	Electric Interlocking at Davis, Illinois 241.3 KB
1935	Electric Interlocking in Snow Sheds on the Southern Pacific 8.2 MB
1943	Electric Interlocking Installed On IC 12.8 MB
1939	Electric Interlocking on the New Haven 2.1 MB
1954	Electric Interlocking on the Rio Grande 3.4 MB
1915	Electric Interlockings in Australia 3.9 MB
1924	Electric Interlockings On the French Northern 4.4 MB
1941	Electric Locking With No Derails 735.7 KB
1920	Electro-Mechanical Interlocker at Sunbury, PA 538.5 KB
1908	Electro-Pneumatic Interlocking Plant On the Chicago & Western Indiana Railroad at 47th Street, Chicago 3.9 MB
1932	Electro-Pneumatic Interlocking With Optical Route Indicators in the New Buenos Aires Terminal 715.1 KB
1915	Electro-Pneumatic Plant at San Francisco 2.4 MB
1962	Electronic Interlocking 2.2 MB
1949	Entrance-Exit Interlocking Installed on Missouri Pacific 3.0 MB
1939	Erie Installs Electric Interlocking 2.2 MB
1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB
1921	Fire Threatened Tie Up At Grand Central Terminal 1.5 MB
1915	First Position Light Signal Installation 580.6 KB
1937	Gauntlet Signals on the B&LE 7.1 MB
1916	Government Drawbridge Signaling 670.2 KB
1935	Great Western Constructs Automatic Interlocking 6.8 MB
1955	How CN increased track capacity 516.4 KB
1955	How to run reverse temporarily 197.6 KB
1954	IC Combines Interlockings 1.5 MB
1946	ICC 50-MPH Signal Hearing 6.9 MB
1944	ICC Annual Signaling Statistics 6.6 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB
1949	ICC Issues Statistics 850.7 KB
1939	ICC Permits Removal of Derails 1.1 MB
1961	ICC Reports on Railroad Safety 189.7 KB
1946	ICC Signaling Investigation 770.4 KB
1913	Illinois Central Alternating Current Signaling 2.5 MB
1939	Illinois Central Application Denied 854.7 KB
1935	Improving Automatic Interlockings 3.5 MB
1936	Interlocking and Remote Control on Erie 18.9 MB
1937	Interlocking and Signaling For New Bridge at New Orleans 5.9 MB
1956	Interlocking Consolidation: Three Into One in Baltimore 6.8 MB
1961	Interlocking Costs 293.9 KB
1955	Interlocking Expedites Terminal Moves 1.6 MB
1908	Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis 7.2 MB
1910	Interlocking Laws in the United States and Canada 821.1 KB
1935	Interlocking on Southern Pacific Suisun Bay Bridge 4.6 MB
1940	Interlocking on the Hudson & Manhattan 6.8 MB
1911	Interlocking on the North Western Terminal 7.6 MB
1956	Interlocking Phones 2.3 MB
1950	Interlocking Plant Horns 1.2 MB
1950	Interlocking Plant Horns 2.3 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
1952	Interlockings Modernized at Three Railroad Crossings 974.7 KB
1915	Jersey City Terminal Interlocking 1.1 MB
1943	Junction and Crossing Included in Centralized Traffic Control On the Missouri Pacific 4.7 MB
1954	Junction Controlled Automatically 2.5 MB
1950	L&N Extends CTC on "EK" 10.4 MB
1947	Large All-Relay Interlocking on the New York Central 2.5 MB
1920	Largest Saxby & Farmer Machine in the United States 1.6 MB
1947	Light-out Protection at Home Signals 233.7 KB
1936	Location of Home Signals at Automatic Interlockings 3.0 MB
1943	Long Island Replaces Interlocking Machine 3.4 MB
1941	Loss of Shunt 912.3 KB
1961	Loss of Shunt at Automatic Interlockings 195.5 KB
1936	Lost Motion in Locking 3.0 MB
1924	Low-Voltage Interlocking on C&NW 1.6 MB
1918	Maintaining an Interlocking Plant at High Tide 241.8 KB
1917	Maintenance of Mechanical Interlocking 595.4 KB
1925	Maintenance on C&NW Terminals 12.5 MB
1910	Mechanical Interlocking at State Line 1.0 MB
1925	Mechanical or Power Interlocking 814.7 KB
1935	Mechanical Plant Replaced by Electric Interlocking 7.2 MB
1916	Method for Checking Mechanical Locking 322.8 KB
1965	Midwest RRs fight the weather 914.3 KB
1944	Military Railway Service in Italy Installs Electric Interlocking 5.6 MB
1939	Mission Tower Interlocking at Los Angeles 9.2 MB
1941	Modern Entrance-Exit Interlocking Replaces Mechanical Plant On Indiana Harbor Belt 6.9 MB
1947	Modern Interlocking Applied to Ore Transportation 1.1 MB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1949	Modern Signaling on a Division 6.6 MB
1943	Modernization of Automatic Signaling On the New York Central 9.8 MB
1938	Modernization of Terminal Interlocking Plants 1.5 MB
1946	More Difficult to Get a Call-On Signal 488.8 KB
1951	More Signal Construction in 1950 1.0 MB
1940	Movable Interlocking Towers 1.2 MB
1955	Much is new in signaling for 1955 826.7 KB
1961	N&W Has an “Underwater Interlocking” 1.7 MB
1911	New 400-Lever Interlocking Machine 3.7 MB
1944	New All-Relay Interlocking at Providence, RI on the New Haven 5.8 MB
1949	New Automatic Block on the Katy 4.7 MB
1916	New Automatic Signals on Grand Trunk 997.0 KB
1917	New C&NW Bascule Bridge Interlocking 761.1 KB
1918	New Electric Interlocking at Clyde, IL 418.7 KB
1936	New Electro-Pneumatic Plant On Pennsylvania at Newark 23.9 MB
1956	New Haven Consolidates Control of Nine Interlocking Layouts 8.3 MB
1915	New Interlockers on the Flint Belt Line 2.2 MB
1947	New Interlocking at Bellevue, Ohio Protects Crossings of Four Railroads 997.9 KB
1949	New Interlocking at Chattanooga Terminal 5.2 MB
1939	New Interlocking at Los Angeles 9.6 MB
1924	New Interlocking Construction Ideas 3.4 MB
1951	New Interlocking in Holland 1.0 MB
1949	New Interlocking in Louisville 5.3 MB
1935	New Interlocking in the Chicago Loop 4.0 MB
1936	New Interlocking Machines Abroad 1.3 MB
1954	New Interlocking on Leads to Docks Saves Time for Ore Trains 2.9 MB
1921	New Interlocking on the Boston Elevated 3.3 MB
1917	New Interlocking Plant in Milwaukee 1.2 MB
1921	New Interlockings at Jacksonville Terminal 3.4 MB
1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB
1918	New Mechanical Plant on Chicago & Alton 702.8 KB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB
1954	New Orleans Passenger Terminal 4.7 MB
1917	New Plant in Chicago Terminal District 591.7 KB
1924	New Plant on the Pennsylvania 3.1 MB
1924	New Reading Interlocking at Camden 3.4 MB
1956	New Three-Track Interchange Includes Interlocking and Talk-Backs 8.9 MB
1935	New York Central Extends South Bend Interlocking 6.0 MB
1937	New York Central Installs First Button-Control Route Interlocking 9.0 MB
1949	New York Central Installs Interlocking 3.3 MB
1944	New York Central Installs NX Interlocking at Utica 5.7 MB
1936	New York Central Interlocking at Syracuse 15.9 MB
1944	New York Central Modernizes an Interlocking 5.0 MB
1917	New York Elevated Signal Improvements 418.8 KB
1955	News Briefs. 1955-08 801.6 KB
1961	News Briefs. 1961-03 1.0 MB
1961	News Briefs. 1961-04 1.5 MB
1961	News Briefs. 1961-05 1.1 MB
1961	News Briefs. 1961-06 718.3 KB
1961	News Briefs. 1961-07 654.1 KB
1961	News Briefs. 1961-11 1.3 MB
1961	News Briefs. 1961-12 971.1 KB
1962	News Briefs. 1962-01 979.5 KB
1962	News Briefs. 1962-02 1.4 MB
1962	News Briefs. 1962-04 1.2 MB
1962	News Briefs. 1962-05 831.1 KB
1963	News Briefs. 1963-01 971.6 KB
1963	News Briefs. 1963-02 1.3 MB
1963	News Briefs. 1963-05 742.2 KB
1963	News Briefs. 1963-06 973.6 KB
1963	News Briefs. 1963-08 1.2 MB
1963	News Briefs. 1963-11 1.4 MB
1964	News Briefs. 1964-02 997.7 KB
1964	News Briefs. 1964-04 1.4 MB
1965	News Briefs. 1965-01 2.0 MB
1965	News Briefs. 1965-12 618.4 KB
1966	News Briefs. 1966-01 1.4 MB
1923	News of the Month (November 1923) 1.8 MB
1915	North Philadelphia Interlocking 828.9 KB
1924	NP Interlocking in Minneapolis 2.3 MB
1956	NX Control Replaces Lever Machine 2.8 MB
1936	NX Electric Interlocking 3.8 MB
1954	NYC Combines Interlockings 2.4 MB
1929	NYC Expands Electric Plant By Adding 48 Levers 2.7 MB
1950	NYC Installs Big NX Plant at Fostoria, Ohio 3.9 MB
1936	NYC Modernizes Electric Interlocking 9.0 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1957	One Machine Controls Two Plants 2.2 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1943	Pacific Electric Installs a Large All-Relay Interlocking 5.3 MB
1950	Passenger Terminal Signals 993.8 KB
1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB
1952	Pennsylvania Railroad Installs Large Modern Interlocking at Passenger Station in Philadelphia 1.6 MB
1921	Progress of Railroad Signaling in America 731.8 KB
1915	Putting a GRS Interlocking Plant in Service 301.9 KB
1936	Railroads Clean Up After Flood Waters 33.3 MB
1943	Railway Signaling in North Africa 3.5 MB
1910	Reconstruction of Burnside Interlocking 863.7 KB
1916	Reconstruction of New Haven Signals 315.5 KB
1947	Relay Interlocking on Lehigh Valley 805.7 KB
1957	Relay Interlocking Saves Time at Yard Entrances 2.5 MB
1937	Remote Control By Code 7.0 MB
1955	Remote Control Eliminates Train Stops 1.3 MB
1941	Remote Control Installation 2.4 MB
1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB
1962	Remote Control Interlocking Has Time Division Multiplex System 855.3 KB
1953	Remote Control Interlockings Improve Terminal Operation 555.6 KB
1947	Remote Control on Baltimore & Ohio 595.8 KB
1936	Remote Control on the Pennsylvania 14.5 MB
1940	Remote Control On the Southern 3.8 MB
1944	Remote Control Project Saves Train Time on the Baltimore & Ohio 3.5 MB
1935	Repeating Reverse Signal Indication 2.9 MB
1908	Reporting System of the Illinois Central Railroad 1.3 MB
1946	Reverse Running on the Pennsylvania 2.8 MB
1937	Route Control Interlocking – A New Signaling Development 2.9 MB
1953	Route Lever Interlocking on Rock Island 6.5 MB
1937	Route Locking Circuits 1.9 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1964	San Francisco will test four ATO systems 1.4 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB
1955	Santa Fe installs CTC on single track 610.2 KB
1937	Selection of Routes at Automatic Interlockings 1.4 MB
1935	Semi-Automatic Interlocking at a Crossing on the Alton 4.4 MB
1937	Semi-Automatic Interlockings on the Boston Elevated 3.8 MB
1951	Signal Modernization Program on the RF&P 1.0 MB
1916	Signaling a New Street Car Terminal 437.5 KB
1947	Signaling and Interlocking in Italy 684.8 KB
1949	Signaling and Interlocking On New Line of New York Subways 6.5 MB
1911	Signaling and Interlocking on the North Western Terminal in Chicago 1.1 MB
1944	Signaling Construction Increased in 1943 8.8 MB
1937	Signaling Eliminates Platform Maintenance 3.9 MB
1934	Signaling of the New York Subways 3.9 MB
1911	Signaling on the New York Tunnel Extension of the Pennsylvania 1.0 MB
1911	Signaling Practice on Steam Railways 5.5 MB
1939	Signaling the Pennsylvania to New York World's Fair 4.2 MB
1951	Simple Interlocking Saves Many Train Stops 364.8 KB
1929	Simplification of Apparatus Will Expand Usefulness of Signaling 1.3 MB
1929	Simplification of Interlocking Permits Economical Installations 967.9 KB
1929	Simplified Electric Interlocking Plant on Michigan Central.pdf 3.6 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1956	Small Flat Top Console for Controls And Separate Diagram for Indications 5.3 MB
1941	Southern Pacific Installs Interlocking at Drawbridge 6.3 MB
1947	Special Controls for Crossing Signals 199.6 KB
1950	Special Interlocking Controls 2.2 MB
1937	Special Locking Release 2.4 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1937	Spring Switch at Branch Line Terminus 5.0 MB
1950	SS Protection 2.1 MB
1928	Stiles Controller for S. & F. Machine 685.1 KB
1910	Supplemental Notes on Drafting Practice 382.8 KB
1937	Switch Indicators Serve as Interlocking Control Devices 5.6 MB
1936	Testing Automatic Interlockings 3.5 MB
1936	Testing New Interlocking 1.7 MB
1936	Testing New Interlocking 3.5 MB
1908	The Electro-Pneumatic Signal and Interlocking System at the New Union Station, Washington, DC 4.5 MB
1945	The Leverman's Viewpoint 427.0 KB
1910	The Multiple Unit Electric Interlocking Machine 1.5 MB
1938	The Outlook for Signaling 1.3 MB
1915	The Push Button Interlocking Plant at Clearing Yard 351.3 KB
1955	The Reading has compact control machine for consolidated interlocking 511.5 KB
1946	The User of Signaling 894.7 KB
1923	The Why of an Electro-Mechanical Plant 1.2 MB
1941	Track Model Lamps 429.7 KB
1937	Train Shunt at Automatic Plants 1.2 MB
1952	Train Time Saved By New Interlocking and Automatic Protection at 15 Street Crossings in Lima, Ohio 4.4 MB
1962	Trains Control Automatic Bridge 1.2 MB
1939	Trains Directed by Signal Indication at San Jose, California 4.1 MB
1940	Trap Circuit 872.0 KB
1935	Trap Circuits at Railroad Crossings 4.6 MB
1915	Trenton Electro-Mechanical Interlocking 1.7 MB
1941	Two New Interlockings on the C&WI 5.1 MB
1909	Union Switch & Signal’s Inspection Trip 1.5 MB
1939	Unusual Signal Trouble 835.4 KB
1935	Use of Marker Lamps 1.0 MB
1915	Victoria Jubilee Bridge Protection 570.0 KB
1954	Wabash Yard Moves Expedited 1.2 MB
1946	War-Time Replacement of Interlocking on Pere Marquette 3.4 MB
1935	Western Indiana Installs All-Relay Interlocking 11.4 MB
1937	What is in Store for the Signal Field? 1.8 MB
1965	What's the Answer? 1965-07 629.7 KB
1961	What’s the Answer? 1961-04 960.3 KB
1928	Why Markers for Automatic Signals? 494.6 KB
1928	Will More Extensive Use of Electric Locking Simplify Interlocking? 642.1 KB
1936	Yard Entrance in Montreal Remotely Controlled 8.2 MB
1955	Yard operations improved by new interlocking and car retarders 621.2 KB

interlocking centralized traffic control 1

1963	Interlocking: New Solid State Devices Save Money 2.1 MB

interlocking consolidation 3

1950	Consolidated Control of Interlockings 1.3 MB
1956	Interlocking Consolidation: Three Into One in Baltimore 6.8 MB
1935	Obsolescence in Signaling 3.4 MB

interlocking laws 1

1911	A Comparison of the Interlocking Laws of the Various States 2.6 MB

interlocking machines 1

1947	Choice of Interlocking Control Machines 266.5 KB

interlocking relay 1

1910	The Hall Signal Company’s New Relay 1.4 MB

interlocking signal 1

1913	The Union’s Signaling Exhibition Room 1.5 MB

interlocking testing 3

1963	Special Report: P&LE Signaling and Communications 3.9 MB
1965	What's the Answer? 1965-07 629.7 KB
1965	What's the answer? 1965-12 261.7 KB

interlocking towers 17

1916	A New York Central Plant in Chicago 590.7 KB
1947	Annual Review and Outlook 425.1 KB
1947	Construction of Towers 213.3 KB
1920	East Somerville Electro-Pneumatic Plant 754.4 KB
1920	Electric Interlocking at Bellefontaine, Ohio 3.8 MB
1919	Electric Interlocking at Charlottesville,VA 530.2 KB
1910	Main Street Tower on the Chicago & North Western at Evanston, IL 666.9 KB
1910	Mechanical Interlocking at State Line 1.0 MB
1940	Movable Interlocking Towers 1.2 MB
1917	New C&NW Bascule Bridge Interlocking 761.1 KB
1918	New Electric Interlocking at Clyde, IL 418.7 KB
1913	New Haven Concrete Interlocking Towers 2.3 MB
1921	New Interlocking on the Boston Elevated 3.3 MB
1917	New Interlocking Plant in Milwaukee 1.2 MB
1918	New Mechanical Plant on Chicago & Alton 702.8 KB
1917	New Plant in Chicago Terminal District 591.7 KB
1910	Reconstruction of Burnside Interlocking 863.7 KB

intermediate signals 1

1943	Intermediate Signals in CTC 1.7 MB

intermittent automatic train stop 1

1962	News Briefs. 1962-04 1.2 MB

intermittent inductive train stop 1

1954	General Railway Signal Company Enters Fiftieth Year 1.6 MB

intermittent inductive tran control 1

1962	News Briefs. 1962-09 835.6 KB

intermittent ramp contact train control 1

1924	Rock Island Installs Train Control 847.9 KB

International Telephone & Telegraph 1

1953	Route Lever Interlocking on Rock Island 6.5 MB

International-Great Northern 1

1947	Territories Involved in the ICC Signaling Order 399.0 KB

Interstate Commerce Commission 112

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB
1944	A Collision Despite Automatic Signals 2.7 MB
1931	A Lesson from a False-Clear Failure 572.9 KB
1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1941	A Simplified Signaling Arrangement For the Direction of Trains by Signal Indications 5.5 MB
1965	AAR and RLEA reply to RS&I exceptions 863.6 KB
1965	AAR excepts to 3 rule changes 647.5 KB
1935	Accident at Automatic Plant 4.5 MB
1936	Accident in Automatic Block Signal Territory 4.7 MB
1943	Accident Involves Signaling 1.0 MB
1939	Action at Approach Signal 964.5 KB
1947	Annual Review and Outlook 425.1 KB
1947	Application of Code Principles to Signaling 406.6 KB
1937	Applications for Signaling Changes 1937-12 2.7 MB
1949	Applications to ICC 1949-11 926.1 KB
1940	ATC Tests Ordered 676.8 KB
1965	B&O would have used radio orders 573.9 KB
1936	Cab Signaling 7.8 MB
1935	Call-on Signal Involved In Accident 1.1 MB
1933	Centralized Traffic Control and Remote Control 575.8 KB
1965	Collision due to signal failure 647.8 KB
1935	Collision on the T&P 2.0 MB
1950	Continued Improvement In Signal Performance 1.3 MB
1924	Controlled Manual Block Signaling With Train Control 5.5 MB
1947	Crossover protection on the GM&O 2.6 MB
1964	Examiner reports on RS&I changes 1.8 MB
1954	Fewer ICC Signal Applications 1.7 MB
1909	First Annual Report of the Block Signal and Train Control Board to the Interstate Commerce Commission 4.0 MB
1922	Four Recent Train Control Studies 7.9 MB
1944	Head-End Collision in Manual Block 874.3 KB
1946	ICC 50-MPH Signal Hearing 6.9 MB
1944	ICC Annual Signaling Statistics 6.6 MB
1939	ICC Approves Automatic Interlocking to Replace Mechanical Plant 1.0 MB
1951	ICC Bureau of Safety Report 740.4 KB
1947	ICC Holds Signal Hearing 507.5 KB
1939	ICC Issues Rules, Standards and Instructions for Signaling 10.3 MB
1949	ICC Issues Statistics 850.7 KB
1941	ICC Manual Block Regulations 518.5 KB
1924	ICC Modifies Train Control Order 5.7 MB
1962	ICC Proposes RS&I Changes 310.7 KB
1964	ICC Proposes RS&I Changes 2.3 MB
1963	ICC Proposes RS&I Changes. 1963-07 3.5 MB
1963	ICC Proposes RS&I Changes. 1963-08 1.1 MB
1964	ICC Proposes RS&I Changes. 1964-03 1.1 MB
1964	ICC Proposes RS&I Changes. 1964-04 659.3 KB
1961	ICC Reports on Railroad Safety 189.7 KB
1963	ICC Reports on Signaling 959.4 KB
1964	ICC Reports on Signaling 954.4 KB
1964	ICC sets conditions for removing electric locks under 136.410 246.1 KB
1946	ICC Signal Hearing 1.3 MB
1947	ICC Signal Hearings 179.7 KB
1946	ICC Signaling Investigation 770.4 KB
1940	Illinois Central Order 1.3 MB
1937	Illinois Central Petitions to Remove Train Control 1.6 MB
1937	Illumination as a Type of Crossing Protection 3.0 MB
1936	Importance of Warning Whistle 6.8 MB
1965	Indication locking inadequate says ICC in report 844.7 KB
1910	Interlocking Laws in the United States and Canada 821.1 KB
1943	Lap Order Results in an Accident 818.6 KB
1935	Letter to the Editor: Highways vs. Railroads 1.7 MB
1927	Michigan Central Train Control Approved 800.8 KB
1941	Monon Changes Approved 760.8 KB
1950	New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB
1955	News Briefs. 1955-08 801.6 KB
1961	News Briefs. 1961-11 1.3 MB
1963	News Briefs. 1963-01 971.6 KB
1963	News Briefs. 1963-05 742.2 KB
1963	News Briefs. 1963-06 973.6 KB
1963	News Briefs. 1963-10 518.0 KB
1963	News Briefs. 1963-11 1.4 MB
1964	News Briefs. 1964-04 1.4 MB
1964	News Briefs. 1964-07 849.5 KB
1964	News Briefs. 1964-10 778.4 KB
1964	News Briefs. 1964-12 998.6 KB
1965	News Briefs. 1965-01 2.0 MB
1965	News Briefs. 1965-03 785.8 KB
1965	News Briefs. 1965-06 1.2 MB
1965	News Briefs. 1965-08 753.7 KB
1965	News Briefs. 1965-09 379.4 KB
1965	News Briefs. 1965-10 1.1 MB
1966	News Briefs. 1966-01 1.4 MB
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
1920	Non-Automatic Blocks and Accident Records 4.3 MB
1941	Non-Stop Permissive Signals 1.4 MB
1955	Pennsylvania installs wayside equipment for cab signaling 745.7 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1924	Results of Train Control Test on Pennsylvania 3.1 MB
1965	RLEA objects to 11 RS&I changes 1.1 MB
1924	Rock Island Installs Train Control 847.9 KB
1941	Rule 204 1.7 MB
1950	Rules, Standards and Instructions 1.5 MB
1949	Santa Fe Gets Some Relief from ICC Signaling Order 2.2 MB
1965	Signal failures reported by ICC 1.1 MB
1937	Signal Inspection Bill Passed by Congress 3.4 MB
1945	Signaling for Spring Switches 579.1 KB
1947	Signaling Order Issued by ICC 533.4 KB
1965	Signalmen's President Jesse Clark discusses safety on the railroads 643.5 KB
1943	Signals Ordered on the Kansas City Southern 1.4 MB
1941	Simplified Signaling 426.9 KB
1940	Single-Track Signaling 2.5 MB
1940	Southern Pacific Petition Denied 3.0 MB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1950	Telephones at Signals 1.1 MB
1947	Territories Involved in the ICC Signaling Order 399.0 KB
1939	The Signaling Regulations 907.9 KB
1924	Train Control Ordered on 92 Roads 397.4 KB
1926	Train Control Progress in 1925 3.1 MB
1940	Trap Circuit 872.0 KB
1932	Uniform Laws and Standards for Crossing Signals 518.8 KB
1928	What Is to Be Gained by Train Stop or Train Control? 463.8 KB

interstate Commerce Commission 1

1963	News Briefs. 1963-04 908.1 KB

Interstate Commerce Commissions 1

1955	Fewer signal failures 645.3 KB

Interurban Electric 3

1939	Cab Signaling and Train Control On the San Francisco-Oakland Bay Bridge 7.2 MB
1939	San Francisco-Oakland Bay Bridge Interlocking Plants 9.4 MB
1939	San Francisco-Oakland Bay Bridge Signaling and Interlocking 7.9 MB

interurban railways 3

1911	Automatic Block Signal System for Electric Railways 4.9 MB
1911	Interurban Block Signals 1.7 MB
1911	Train Dispatching on Interurban Railways 2.0 MB

Iola, KS 1

1934	Automatic Interlockings on the Santa Fe 2.2 MB

Iona, TX 1

1955	News Briefs. 1955-08 801.6 KB

Iowa Board of Railroad Commissioners 1

1935	Accident at Automatic Plant 4.5 MB

Iowa State Commerce Commission 1

1950	Gate-Arm Stripe Colors 3.4 MB

Iron Jct., MN 2

1944	CTC Speeds Ore Traffic On the DM&IR 4.6 MB
1962	DM&IR Consolidates CTC Control Miles 384.7 KB

Iron Ore Co. 1

1962	1962 outlook 3.0 MB

Iron Ore Co. of Canada 1

1962	Automatic Freight Train is Crewless 1.1 MB

Ironton, OH 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Irvin, WA 1

1962	News Briefs. 1962-10 457.3 KB

Irvineton, PA 1

1916	William Robinson, Inventor of the Track Circuit 373.1 KB

Irvington, KY 1

1947	CTC Down by the Ohio 2.7 MB

Iselin, TN 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

island circuit 1

1965	GCPs can be used for various types of grade crossings 374.6 KB

Italian State Railways 1

1944	Military Railway Service in Italy Installs Electric Interlocking 5.6 MB

Italy 2

1944	Military Railway Service in Italy Installs Electric Interlocking 5.6 MB
1947	Signaling and Interlocking in Italy 684.8 KB

Itasca, IL 1

1910	Construction Crew on the CM&StP 420.8 KB

IU Tower, Indianapolis, IN 1

1931	Indianapolis Union Station Installs Electro-Pneumatic Interlocking 4.7 MB

Ivanhoe, IN 1

1918	Rear End Collision on the Michigan Central 471.2 KB

Ivorydale Jct., OH 1

1951	B&O Installs Modern Interlocking 871.3 KB

Ivy, VA 1

1965	News Briefs. 1965-01 2.0 MB

Railway Signaling: I

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