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.
40-hour week 1
"BY" Tower, Baltimore, MD 1
B&O Installs All-Relay Plant
2.6 MB
|
absolute signals 2
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Differentiation Between Signals
1.1 MB
|
|
Differentiation Between Signals
955.8 KB
|
Alhambra, CA 1
|
CTC on Sunset Route
3.1 MB
|
all-relay interlocking 1
|
B&O Installs All-Relay Plant
2.6 MB
|
annunciator control 1
approach indications 1
|
Approach Distances and Times
5.5 MB
|
approach lighting 1
approach locking 2
|
Approach Distances and Times
5.5 MB
|
|
Retained-Neutral Neutral Relay
3.4 MB
|
Atchison, Topeka & Santa Fe 4
Atlanta Terminal 1
Atlanta, GA 1
Atlantic Coast Line 1
|
Unusual Trouble
3.0 MB
|
Aurant, CA 1
|
CTC on Sunset Route
3.1 MB
|
automatic block signaling 10
automatic interlocking 2
automatic train control 1
|
Signaling and Rules
1.4 MB
|
automatic train stop 3
Bailey, Baltimore, MD 1
|
B&O Installs All-Relay Plant
2.6 MB
|
Ballantyne, Quebec 1
Baltimore & Ohio 3
|
B&O Installs All-Relay Plant
2.6 MB
|
|
Lunar White
419.3 KB
|
|
NYC Installs Big NX Plant at Fostoria, Ohio
3.9 MB
|
Baltimore, MD 1
|
B&O Installs All-Relay Plant
2.6 MB
|
Blackey, KY 1
|
L&N Extends CTC on "EK"
10.4 MB
|
Blakesley, OH 1
|
CTC on the Wabash
2.6 MB
|
bonding 1
|
Bootleg Risers and Bonds
2.1 MB
|
Boston & Maine 3
|
Flashing Signal Aspects
1.1 MB
|
|
Gate-Arm Stripe Colors
3.4 MB
|
|
Two Single Tracks, Side By Side
1.4 MB
|
Boyce, VA 1
Bragdon, CO 1
braking distance 1
|
Stopping Distance on Grades
3.5 MB
|
Brewster, OH 1
Bronx, NY 1
Burley, Paul B. 1
|
Personnel changes on the IC
1.4 MB
|
Butler, IN 1
|
CTC on the Wabash
2.6 MB
|
cab signaling 3
Canadian National 1
|
DC Track Circuit Trouble
1.6 MB
|
Canadian Pacific 1
carrier control 1
|
Increasing Use of Carrier
1.3 MB
|
Central of Georgia 3
|
Differentiation Between Signals
955.8 KB
|
|
Grade Signal Controls
2.1 MB
|
|
Spring Switch Signaling
2.5 MB
|
centralized traffic control 21
Chesapeake & Ohio 4
Chicago & Illinois Midland 1
|
OSing Device
1.4 MB
|
Chicago & North Western 3
Chicago Great Western 1
Chicago Heights, IL 1
Chicago South Shore & South Bend 1
|
Gate-Arm Stripe Colors
3.4 MB
|
Chicago Transit Authority 1
|
Lunar White
419.3 KB
|
Chicago, Burlington & Quincy 3
Chicago, IL 1
Chicago, Indianapolis & Louisville 1
|
Differentiation Between Signals
955.8 KB
|
Chicago, Milwaukee, St. Paul & Pacific 2
|
Special Interlocking Controls
2.2 MB
|
|
Unusual Trouble
3.0 MB
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Chicago, Rock Island & Pacific 2
|
Increasing Use of Carrier
1.3 MB
|
|
Microwaves on Railroads
1.3 MB
|
classification yards 1
Clinchfield 1
code line 2
|
CTC Code Lines
1.1 MB
|
|
L&N Extends CTC on "EK"
10.4 MB
|
code line units 1
|
New Developments
16.9 MB
|
coded remote control 1
|
New Developments
16.9 MB
|
coded track circuits 1
color light signals 1
color position light signals 1
|
B&O Installs All-Relay Plant
2.6 MB
|
Colton, CA 1
|
CTC on Sunset Route
3.1 MB
|
Columbus, OH 1
communication 6
communication trouble 1
|
Unusual Trouble
3.0 MB
|
computerized reservations 1
continuous inductive receiver coils 1
|
New Developments
16.9 MB
|
De Kalb, IL 1
Delano, VA 1
Denver & Rio Grande Western 2
Denver & Salt Lake 1
Denver, CO 1
disc signals 1
|
CTC on the Reading
6.6 MB
|
DN-26 relay 1
DP-20 relay 1
DP-21 relay 1
dragging equipment detectors 1
Dublin, VA 1
Durham, NC 1
Dutton, George B. Jr. 1
|
Approach Distances and Times
5.5 MB
|
East St. Louis, IL 1
electric lock switches 1
Elgin, Joliet & Eastern 2
|
Grade Signal Controls
2.1 MB
|
|
Signals for Trains at Highway Crossings
5.9 MB
|
Erwin, TN 1
flood detectors 1
|
Flood Detectors on the Katy
2.7 MB
|
Fostoria, OH 1
Fox Jct., CO 1
freight houses 1
Ft. Wayne, IN 1
|
CTC on the Wabash
2.6 MB
|
Ft. Worth & Denver City 1
|
Grade Signal Controls
2.1 MB
|
gate arm stripe colors 2
|
Gate-Arm Stripe Colors
1.1 MB
|
|
Gate-Arm Stripe Colors
3.4 MB
|
GB Cabin, OH 1
General Railway Signal 5
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B&O Installs All-Relay Plant
2.6 MB
|
|
Big NX Interlocking at Atlanta
6.3 MB
|
|
CTC Extended on the Rio Grande
4.4 MB
|
|
CTC on the Reading
6.6 MB
|
|
Double to Single Track with Remote Control
4.2 MB
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Geneva, IL 1
Gerlach, NV 1
GN Cabin, OH 1
Grabill, IN 1
|
CTC on the Wabash
2.6 MB
|
grade signals 1
|
Grade Signal Controls
2.1 MB
|
Grand Trunk Western 1
|
Gate-Arm Stripe Colors
3.4 MB
|
Gulf, Mobile & Ohio 1
H-2 searchlight signals 1
Hagerstown, MD 1
Hannibal, MO 1
Havana, IL 1
|
OSing Device
1.4 MB
|
high-speed turnouts 1
|
High Speed Turnout Signaling
2.3 MB
|
highway crossings 9
Hobart, IN 1
Homestead, OH 1
horns 2
|
Interlocking Plant Horns
1.2 MB
|
|
Interlocking Plant Horns
2.3 MB
|
Howell, GA 2
hump yard 1
hydraulic pressure bond machine 1
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New Developments
16.9 MB
|
Illinois Central 4
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Flashing Signal Aspects
1.1 MB
|
|
IC Rebuilds Classification Yard
6.9 MB
|
|
Personal: T. B. Thompson
1.1 MB
|
|
Personnel changes on the IC
1.4 MB
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indication codes 1
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CTC Indication Code
1.2 MB
|
Indio, CA 1
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CTC on Sunset Route
3.1 MB
|
inductive train communication 3
Inman Yard, Howell, GA 1
instrument cases 1
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Instrument Case Platforms
3.7 MB
|
interlocking 13
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Approach Distances and Times
5.5 MB
|
|
B&O Installs All-Relay Plant
2.6 MB
|
|
Big NX Interlocking at Atlanta
6.3 MB
|
|
Consolidated Control of Interlockings
1.3 MB
|
|
Consolidation of Interlockings
2.5 MB
|
|
CTC on the Reading
6.6 MB
|
|
Interlocking Plant Horns
1.2 MB
|
|
Interlocking Plant Horns
2.3 MB
|
|
L&N Extends CTC on "EK"
10.4 MB
|
|
NYC Installs Big NX Plant at Fostoria, Ohio
3.9 MB
|
|
Passenger Terminal Signals
993.8 KB
|
|
Special Interlocking Controls
2.2 MB
|
|
SS Protection
2.1 MB
|
interlocking consolidation 1
Interstate Commerce Commission 4
Iowa State Commerce Commission 1
|
Gate-Arm Stripe Colors
3.4 MB
|
Kansas City, MO 1
Knoxville, TN 1
Lees Cross Roads, PA 1
|
CTC on the Reading
6.6 MB
|
Lehigh Valley 2
light-out circuits 2
Lockbourne, OH 1
Long Island 2
|
Increasing Use of Carrier
1.3 MB
|
|
Microwaves on Railroads
1.3 MB
|
Louisville & Nashville 3
|
Bootleg Risers and Bonds
2.1 MB
|
|
Gate-Arm Stripe Colors
3.4 MB
|
|
L&N Extends CTC on "EK"
10.4 MB
|
Lucasville, OH 1
lunar white 2
|
Lunar White
419.3 KB
|
|
Spring Switch Signaling
2.5 MB
|
Lurgan, PA 1
|
CTC on the Reading
6.6 MB
|
Lynchburg, VA 1
Manito, IL 1
|
OSing Device
1.4 MB
|
manual block signaling 2
Marion, VA 1
Markham Yard, IL 1
mechanical interlocking 2
Memphis Union Station 1
|
SS Protection
2.1 MB
|
microwave communication 1
|
Microwaves on Railroads
1.3 MB
|
Minford, OH 1
Minneapolis, St. Paul & Sault Ste. Marie 2
|
Bootleg Risers and Bonds
2.1 MB
|
|
Spring Switch Signaling
2.5 MB
|
Missouri Pacific 3
|
Stopping Distance on Grades
3.5 MB
|
|
Two Single Tracks, Side By Side
1.4 MB
|
|
Unusual Trouble
3.0 MB
|
Missouri-Kansas-Texas 1
|
Flood Detectors on the Katy
2.7 MB
|
Moffat Tunnel 1
Monon 1
|
Differentiation Between Signals
955.8 KB
|
Montpelier, OH 1
|
CTC on the Wabash
2.6 MB
|
Montreal, Quebec 1
movable bridges 1
moving CTC machines 1
Nachusa, IL 1
Nashville, Chattanooga & St. Louis 1
National of Mexico 1
|
Instrument Case Platforms
3.7 MB
|
Nelson, IL 1
neon lighting 1
new developments 1
|
New Developments
16.9 MB
|
New Haven, IN 1
|
CTC on the Wabash
2.6 MB
|
New York Central 6
|
Differentiation Between Signals
1.1 MB
|
|
Gate-Arm Stripe Colors
3.4 MB
|
|
Instrument Case Platforms
3.7 MB
|
|
NYC Installs Big NX Plant at Fostoria, Ohio
3.9 MB
|
|
Obituary: B. J. Schwendt
966.4 KB
|
|
Temporary Change of Signal Controls
2.2 MB
|
New York subway 1
New York, Chicago & St. Louis 3
New York, New Haven & Hartford 2
|
Approach Distances and Times
5.5 MB
|
|
Stopping Distance on Grades
3.5 MB
|
New York, NY 1
NJ Cabin, KY 1
Norfolk & Western 2
|
Neon Lighting For Crossing Gate Arms
3.1 MB
|
|
Unusual Signals
1.1 MB
|
Norfolk, VA 1
North Denver, CO 1
North Milwaukee, WI 1
Northern Pacific 1
|
Interlocking Plant Horns
2.3 MB
|
NX interlocking 2
obituary 1
|
Obituary: B. J. Schwendt
966.4 KB
|
Ohio Brass 1
|
New Rail-Web Bond
1.3 MB
|
operating rules 1
|
Signaling and Rules
1.4 MB
|
Orestod, CO 1
OS device 1
|
OSing Device
1.4 MB
|
Outremont, Quebec 1
Palmer Lake, CO 1
Parsons Yard, OH 1
passenger reservations 1
passenger terminals 1
|
Passenger Terminal Signals
993.8 KB
|
Pekin, IL 1
|
OSing Device
1.4 MB
|
Pelham Bay Line, New York, NY 1
Pennsylvania 7
Pennsylvania-Reading Seashore Lines 1
|
Passenger Terminal Signals
993.8 KB
|
Pergo, OH 1
|
CTC on the Wabash
2.6 MB
|
permissive signals 2
|
Differentiation Between Signals
1.1 MB
|
|
Differentiation Between Signals
955.8 KB
|
personal 1
|
Personnel changes on the IC
1.4 MB
|
Pomona, CA 1
|
CTC on Sunset Route
3.1 MB
|
Portola, CA 1
promotion 1
|
Personal: T. B. Thompson
1.1 MB
|
Pulaski, VA 1
radio 1
|
Increasing Use of Carrier
1.3 MB
|
rail bonding 1
|
New Rail-Web Bond
1.3 MB
|
Ravenna, KY 1
|
L&N Extends CTC on "EK"
10.4 MB
|
Reading 2
|
CTC on the Reading
6.6 MB
|
|
Passenger Terminal Signals
993.8 KB
|
relay timers 1
|
New Developments
16.9 MB
|
remote control 1
retained-neutral neutral relay 1
retained-neutral relay 1
retarders 1
Richlands, VA 1
Roanoke, VA 1
Robbins, OH 1
route interlocking 1
rules enforcement 1
|
Signaling and Rules
1.4 MB
|
Rules, Standards and Instructions 3
Rural Retreat, VA 1
Russell, KY 1
Salem, VA 1
Schwendt, B. J. 1
|
Obituary: B. J. Schwendt
966.4 KB
|
Seaboard Air Line 2
|
Big NX Interlocking at Atlanta
6.3 MB
|
|
CTC Indication Code
1.2 MB
|
searchlight signals 1
Shippensburg, PA 1
|
CTC on the Reading
6.6 MB
|
signal aspects 3
|
High Speed Turnout Signaling
2.3 MB
|
|
Lunar White
419.3 KB
|
|
Signaling and Rules
1.4 MB
|
signal failures 1
signal indications 1
|
Signaling and Rules
1.4 MB
|
signal performance 1
signaling 1
|
Spring Switch Signaling
2.5 MB
|
slow orders 1
South Denver, CO 1
Southern 3
Southern Pacific 2
|
CTC on Sunset Route
3.1 MB
|
|
Interlocking Plant Horns
2.3 MB
|
space reservation 1
|
New Developments
16.9 MB
|
Spencerville, IN 1
|
CTC on the Wabash
2.6 MB
|
spring switches 3
Springfield, IL 2
Springfield, MO 2
SS protection 1
|
SS Protection
2.1 MB
|
St. Joe, IN 1
|
CTC on the Wabash
2.6 MB
|
St. Louis-San Francisco 3
St. Luc, Quebec 1
Suffolk, VA 1
switch locks 1
|
New Developments
16.9 MB
|
switch machine controller 1
|
New Developments
16.9 MB
|
switching signals 1
telephone service 1
telephones 1
|
Telephones at Signals
1.1 MB
|
Terminal Railroad Association of St. Louis 3
terminals 1
testing 1
|
DC Track Circuit Trouble
1.6 MB
|
Texas & Pacific 1
Thompson, T. B. 1
|
Personal: T. B. Thompson
1.1 MB
|
time locking 1
|
Approach Distances and Times
5.5 MB
|
time releases 1
|
Approach Distances and Times
5.5 MB
|
torpedo fusee 1
|
New Developments
16.9 MB
|
track circuits 1
|
DC Track Circuit Trouble
1.6 MB
|
traffic control system 2
traffic locking 2
|
CTC on the Reading
6.6 MB
|
|
Two Single Tracks, Side By Side
1.4 MB
|
train communication 1
train dispatching 1
train order fork 1
|
Illuminated Train Order Fork
1.1 MB
|
train order signals 1
|
Flashing Signal Aspects
1.1 MB
|
train orders 1
|
Illuminated Train Order Fork
1.1 MB
|
train radio 2
transformers 1
|
New Developments
16.9 MB
|
trap circuits 1
|
Bootleg Risers and Bonds
2.1 MB
|
Trissal, J. M. 1
|
Personnel changes on the IC
1.4 MB
|
Union Route interlocking 1
Union Switch & Signal 7
|
Continuity of Train Communication
2.6 MB
|
|
CTC Installed on 128 Miles of NKP
12.1 MB
|
|
CTC on Sunset Route
3.1 MB
|
|
Microwaves on Railroads
1.3 MB
|
|
Retained-Neutral Neutral Relay
3.4 MB
|
|
Route Type Interlocking on New York Subway
8.7 MB
|
|
SS Protection
2.1 MB
|
unusual signals 1
|
Unusual Signals
1.1 MB
|
Virginian 1
|
Differentiation Between Signals
955.8 KB
|
Wabash 2
Waukesha, WI 1
|
Bootleg Risers and Bonds
2.1 MB
|
Waverly, VA 1
wayside signals 1
West Chicago, IL 1
Westchester Yard, Bronx, NY 1
Western Pacific 4
Western Union 1
|
Increasing Use of Carrier
1.3 MB
|
Wheeler, OH 1
Wheeling & Lake Erie 1
Wichita Falls, TX 1
|
Flood Detectors on the Katy
2.7 MB
|