Railway Signaling: 1940

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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.

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"S" markers 1

1940	Entering the Main Line 1.3 MB

1940 1

1940	1940 index 3.9 MB

33rd Street, New York, NY 1

1940	Interlocking on the Hudson & Manhattan 6.8 MB

absolute permissive block signaling 3

1940	Entering the Main Line 1.3 MB
1940	Proceeding By a Head-Block Signal 1.9 MB
1940	Single-Track Signaling 2.5 MB

accident 2

1940	Panama Limited Collides With Louisiane 1.0 MB
1940	Two Accidents on the Illinois Central 2.8 MB

accidents 1

1940	ATC Tests Ordered 676.8 KB

Almeda, IN 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

ammeter 1

1940	Hook-On Volt-Ammeter 1.3 MB

Anoka, IN 1

1940	11,000-Ft. Coded Track Circuits 13.6 MB

Arcola, IL 2

1940	Panama Limited Collides With Louisiane 1.0 MB
1940	Two Accidents on the Illinois Central 2.8 MB

Ashburn, Chicago, IL 2

1940	Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB
1940	Interlockings Installed at Two Crossings 6.5 MB

automatic block signaling 10

1940	11,000-Ft. Coded Track Circuits 13.6 MB
1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB
1940	Entering the Main Line 1.3 MB
1940	Intermediate Signal Spacing and Control 2.1 MB
1940	New Automatic Block Signaling on the Milwaukee 6.3 MB
1940	New Signaling on the Wabash 8.1 MB
1940	Proceeding By a Head-Block Signal 1.9 MB
1940	Single-Track Signaling 2.5 MB
1940	Southern Pacific Petition Denied 3.0 MB

automatic train stop 4

1940	ATC Tests Ordered 676.8 KB
1940	Illinois Central Order 1.3 MB
1940	Panama Limited Collides With Louisiane 1.0 MB
1940	Two Accidents on the Illinois Central 2.8 MB

Belt Railway of Chicago 1

1940	Interlockings Installed at Two Crossings 6.5 MB

Ben Davis, IN 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

Beulah, MN 1

1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

block 1

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB

block length 1

1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB

bonding 1

1940	Cadweld (Thermex) Signal Bonds 996.4 KB

Bradford, OH 1

1940	11,000-Ft. Coded Track Circuits 13.6 MB

braking distance 1

1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB

Buchanan Branch 1

1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB

cab signaling 2

1940	ATC Tests Ordered 676.8 KB
1940	Illinois Central Order 1.3 MB

Cadosia, NY 1

1940	CTC on the New York, Ontario & Western 8.2 MB

Cadweld 1

1940	Cadweld (Thermex) Signal Bonds 996.4 KB

Casey, IL 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

CD code-following relays 1

1940	Plug Couplers for Relays and Signals 1.3 MB

centralized traffic control 7

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB
1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB
1940	CTC on the New York, Ontario & Western 8.2 MB
1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB
1940	Single-Track Signaling 2.5 MB
1940	Train Order Signals 4.2 MB

centrifugal relays 1

1940	Plug Couplers for Relays and Signals 1.3 MB

Chesapeake & Ohio 1

1940	Single-Track Signaling 2.5 MB

Chicago, Burlington & Quincy 1

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB

Chicago, IL 2

1940	Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB
1940	Interlockings Installed at Two Crossings 6.5 MB

Chicago, Milwaukee, St. Paul & Pacific 2

1940	Drafting Boards 1.8 MB
1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

Chicago, Rock Island & Pacific 1

1940	Obituary: Leroy Wyant 1.0 MB

cleaning 1

1940	Signal Lens Cleaner 1.1 MB

Clearing Yard, Chicago, IL 1

1940	Interlockings Installed at Two Crossings 6.5 MB

Cleveland, Cincinnati, Chicago & St. Louis 1

1940	Mechanical Plant Modernized 4.2 MB

code transmitter 2

1940	Coded Track Control 2.5 MB
1940	New Code Transmitter 2.1 MB

code-following relay 1

1940	Coded Track Control 2.5 MB

coded track circuits 4

1940	11,000-Ft. Coded Track Circuits 13.6 MB
1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB
1940	Coded Track Control 2.5 MB

Cold Springs, OH 1

1940	Mechanical Plant Modernized 4.2 MB

color light signals 1

1940	Signal Lens Cleaner 1.1 MB

Corcoran, J. J. 1

1940	Personal: Changes on the New York Central 2.2 MB

Cornwall, NY 1

1940	CTC on the New York, Ontario & Western 8.2 MB

DC coded track circuits 1

1940	11,000-Ft. Coded Track Circuits 13.6 MB

DC coding units 1

1940	Plug Couplers for Relays and Signals 1.3 MB

decoder units 1

1940	Coded Track Control 2.5 MB

Detroit River tunnel 1

1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB

Devon, WV 1

1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB

distant signals 1

1940	Southern Pacific Petition Denied 3.0 MB

DM code transmitter 1

1940	New Code Transmitter 2.1 MB

DN-11 relay 1

1940	Plug Couplers for Relays and Signals 1.3 MB

DP-14 relay 1

1940	Plug Couplers for Relays and Signals 1.3 MB

drafting 1

1940	Drafting Boards 1.8 MB

electric lock switches 1

1940	Entering the Main Line 1.3 MB

electro-pneumatic interlocking 1

1940	Interlocking on the Hudson & Manhattan 6.8 MB

Elliott, W. H. 1

1940	Personal: Changes on the New York Central 2.2 MB

Elsworth, R. B. 1

1940	Personal: Changes on the New York Central 2.2 MB

facing point locks 2

1940	Facing Point Lock for Spring Switches 1.2 MB
1940	Facing Point Locks On Main Line Switches 2.6 MB

Farrington, IL 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

Ferguson, MO 1

1940	New Signaling on the Wabash 8.1 MB

fire 2

1940	Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB
1940	St. Louis Terminal 403.1 KB

flagging 1

1940	Entering the Main Line 1.3 MB

flasher relay 1

1940	Flasher Relay 1.7 MB

Gardnerville, MO 1

1940	New Signaling on the Wabash 8.1 MB

General Railway Signal 7

1940	Coded Track Control 2.5 MB
1940	Controller Adjuster 1.3 MB
1940	Facing Point Lock for Spring Switches 1.2 MB
1940	Interlockings Installed at Two Crossings 6.5 MB
1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB
1940	New Searchlight Signal 2.7 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB

Giard, MN 1

1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

Grand Trunk Western 1

1940	Interlockings Installed at Two Crossings 6.5 MB

H searchlight signals 1

1940	Plug Couplers for Relays and Signals 1.3 MB

H-2 searchlight signals 1

1940	Plug Couplers for Relays and Signals 1.3 MB

H-5 searchlight signals 1

1940	New Signaling on the Wabash 8.1 MB

Haigh, A. S. 1

1940	Personal: Changes on the New York Central 2.2 MB

Hayford, Chicago, IL 1

1940	Interlockings Installed at Two Crossings 6.5 MB

highway crossings 2

1940	Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB
1940	Wabash Installs Gate and Signal Protection for All Crossings in Lafayette 4.9 MB

Home Creek, VA 1

1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB

Hudson & Manhattan 1

1940	Interlocking on the Hudson & Manhattan 6.8 MB

Illinois Central 4

1940	ATC Tests Ordered 676.8 KB
1940	Illinois Central Order 1.3 MB
1940	Panama Limited Collides With Louisiane 1.0 MB
1940	Two Accidents on the Illinois Central 2.8 MB

Independent Subway System 1

1940	Signal Lens Cleaner 1.1 MB

index 1

1940	1940 index 3.9 MB

insulated joints 1

1940	Testing Insulated Joints 2.1 MB

insulators 1

1940	Southern Pacific Washes Insulators 1.5 MB

interlocking 9

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB
1940	Interlocking on the Hudson & Manhattan 6.8 MB
1940	Interlockings Installed at Two Crossings 6.5 MB
1940	Movable Interlocking Towers 1.2 MB
1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB
1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB
1940	Remote Control On the Southern 3.8 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1940	Trap Circuit 872.0 KB

interlocking towers 1

1940	Movable Interlocking Towers 1.2 MB

Interstate Commerce Commission 7

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB
1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1940	ATC Tests Ordered 676.8 KB
1940	Illinois Central Order 1.3 MB
1940	Single-Track Signaling 2.5 MB
1940	Southern Pacific Petition Denied 3.0 MB
1940	Trap Circuit 872.0 KB

Key System 1

1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB

Knoxville, TN 1

1940	Remote Control On the Southern 3.8 MB

Lafayette, IN 1

1940	Wabash Installs Gate and Signal Protection for All Crossings in Lafayette 4.9 MB

lenses 1

1940	Signal Lens Cleaner 1.1 MB

Limedale, IN 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

line circuits 1

1940	Southern Pacific Washes Insulators 1.5 MB

Logansport, IN 1

1940	11,000-Ft. Coded Track Circuits 13.6 MB

Luke, VA 1

1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB

Macksville, IL 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

manual block signaling 2

1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1940	Train Order Signals 4.2 MB

Marquette, MN 1

1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

master transformer 1

1940	Coded Track Control 2.5 MB

Michigan Central 2

1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB
1940	Train Order Signals 4.2 MB

Missouri Pacific 4

1940	"Running" Passing Tracks 1.1 MB
1940	Proceeding By a Head-Block Signal 1.9 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1940	Single-Track Signaling 2.5 MB

Mock, J. C. 1

1940	Personal: Changes on the New York Central 2.2 MB

Model 15 AC relays 1

1940	Plug Couplers for Relays and Signals 1.3 MB

Model 2A semaphore 1

1940	Controller Adjuster 1.3 MB

Monona, MN 1

1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

Nachod Signal 1

1940	Make-Up-Time Chart 813.1 KB

New York Central 1

1940	Personal: Changes on the New York Central 2.2 MB

New York, Chicago & St. Louis 1

1940	Trap Circuit 872.0 KB

New York, NY 2

1940	Interlocking on the Hudson & Manhattan 6.8 MB
1940	Signal Lens Cleaner 1.1 MB

New York, Ontario & Western 2

1940	CTC on the New York, Ontario & Western 8.2 MB
1940	Single-Track Signaling 2.5 MB

Norfolk & Western 3

1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB
1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB
1940	Intermediate Signal Spacing and Control 2.1 MB

Norfolk, VA 1

1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB

Northern Pacific 1

1940	D.C. Test Set For Relays, Slots 3.7 MB

NX interlocking 2

1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB

Oakland, CA 2

1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB
1940	Southern Pacific Washes Insulators 1.5 MB

obituary 1

1940	Obituary: Leroy Wyant 1.0 MB

overlap control 1

1940	Southern Pacific Petition Denied 3.0 MB

passing sidings 1

1940	"Running" Passing Tracks 1.1 MB

pendulum type code transmitters 1

1940	Plug Couplers for Relays and Signals 1.3 MB

Pennsylvania 5

1940	11,000-Ft. Coded Track Circuits 13.6 MB
1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB
1940	Pennsylvania Testing Procedure 16.6 MB
1940	Pennsylvania Testing Procedure (Part II) 8.6 MB
1940	Pennsylvania Testing Procedure (Part III) 8.9 MB

personal 2

1940	Obituary: Leroy Wyant 1.0 MB
1940	Personal: Changes on the New York Central 2.2 MB

Petersburg, VA 1

1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB

plug coupler 1

1940	Plug Couplers for Relays and Signals 1.3 MB

position light signals 1

1940	Coded Signaling Control System on the Norfolk & Western 10.0 MB

relays 2

1940	D.C. Test Set For Relays, Slots 3.7 MB
1940	Effecting Time Delay for Relays 933.3 KB

remote control 1

1940	Remote Control On the Southern 3.8 MB

route interlocking 1

1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB

Rules, Standards and Instructions 1

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB

San Francisco, CA 1

1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB

San Francisco-Oakland Bay Bridge 1

1940	Determination of Block Lengths on the San Francisco-Oakland Bay Bridge 4.0 MB

scheduling 1

1940	Make-Up-Time Chart 813.1 KB

searchlight signals 2

1940	New Searchlight Signal 2.7 MB
1940	New Signaling on the Wabash 8.1 MB

semaphore controller 1

1940	Controller Adjuster 1.3 MB

semaphore signals 1

1940	New Searchlight Signal 2.7 MB

signal indications 1

1940	Single-Track Signaling 2.5 MB

Signal Section 1

1940	A Change in the Requisites, Definitions and Regulations 1.2 MB

signal testing 3

1940	Pennsylvania Testing Procedure 16.6 MB
1940	Pennsylvania Testing Procedure (Part II) 8.6 MB
1940	Pennsylvania Testing Procedure (Part III) 8.9 MB

SLV-13 AC relays 1

1940	Plug Couplers for Relays and Signals 1.3 MB

Southern 2

1940	Intermediate Signal Spacing and Control 2.1 MB
1940	Remote Control On the Southern 3.8 MB

Southern Pacific 2

1940	Southern Pacific Petition Denied 3.0 MB
1940	Southern Pacific Washes Insulators 1.5 MB

spring switches 2

1940	Facing Point Lock for Spring Switches 1.2 MB
1940	Facing Point Locks On Main Line Switches 2.6 MB

St. Louis, MO 3

1940	Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1940	St. Louis Terminal 403.1 KB

St. Louis-San Francisco 1

1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB

Stoltz, C. F. 1

1940	Personal: Changes on the New York Central 2.2 MB

switch circuit controllers 1

1940	Facing Point Locks On Main Line Switches 2.6 MB

switches 1

1940	Testing Switches 1.1 MB

Terminal Railroad Association of St. Louis 2

1940	Fire Destroys Tower of Large Interlocking at St. Louis 2.0 MB
1940	St. Louis Terminal 403.1 KB

Terre Haute, IN 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

testing 4

1940	D.C. Test Set For Relays, Slots 3.7 MB
1940	Hook-On Volt-Ammeter 1.3 MB
1940	Testing Insulated Joints 2.1 MB
1940	Testing Switches 1.1 MB

testing circuits 1

1940	Shunting Straps for Testing 890.4 KB

timekeeping 1

1940	Make-Up-Time Chart 813.1 KB

timing 1

1940	Effecting Time Delay for Relays 933.3 KB

Tower Grove, MO 1

1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB

track circuits 1

1940	Testing Insulated Joints 2.1 MB

train order signals 1

1940	Train Order Signals 4.2 MB

train stops 1

1940	Interlocking on the Hudson & Manhattan 6.8 MB

trap circuits 1

1940	Trap Circuit 872.0 KB

two-position signaling 1

1940	Southern Pacific Petition Denied 3.0 MB

Type SC signals 1

1940	New Searchlight Signal 2.7 MB

Union Switch & Signal 7

1940	CTC on the New York, Ontario & Western 8.2 MB
1940	Interlocking on the Hudson & Manhattan 6.8 MB
1940	New Automatic Block Signaling on the Milwaukee 6.3 MB
1940	New Code Transmitter 2.1 MB
1940	New Signaling on the Wabash 8.1 MB
1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB
1940	Plug Couplers for Relays and Signals 1.3 MB

Wabash 5

1940	Gates, Signals and Traffic Lights at a Wabash Crossing 6.8 MB
1940	Interlockings Installed at Two Crossings 6.5 MB
1940	New Signaling on the Wabash 8.1 MB
1940	Single-Track Signaling 2.5 MB
1940	Wabash Installs Gate and Signal Protection for All Crossings in Lafayette 4.9 MB

Weller Yard, VA 1

1940	Centralized Traffic Control Solves Problem on the Norfolk & Western 7.5 MB

West Casey, IL 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

Wiegand, F. B. 1

1940	Personal: Changes on the New York Central 2.2 MB

Windsor, Ontario 1

1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB

Wyant, Leroy 1

1940	Obituary: Leroy Wyant 1.0 MB

Railway Signaling: 1940

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