Railway Signaling: 1951

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.

"S" markers 2

1951	Double to Single Track 60 Miles on the Erie 1.1 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

"TRAIN" indicators 1

1951	Approach Train Indicators 402.6 KB

's Hertogenbosch 1

1951	New Interlocking in Holland 1.0 MB

1951 1

1951	1951 index 4.8 MB

Alexandria, VA 1

1951	Signal Modernization Program on the RF&P 1.0 MB

all-relay interlocking 6

1951	B&O Installs Modern Interlocking 871.3 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB
1951	Signal Modernization Program on the RF&P 1.0 MB

Alliance, NE 2

1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	More Signal Construction in 1950 1.0 MB

Amqui, TN 1

1951	More Signal Construction in 1950 1.0 MB

aspects and indications 4

1951	New Interlocking in Holland 1.0 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Atchison, Topeka & Santa Fe 2

1951	Approach Train Indicators 402.6 KB
1951	More Signal Construction in 1950 1.0 MB

Atlantic Coast Line 1

1951	Signal Modernization Program on the RF&P 1.0 MB

Attica, NY 1

1951	Double to Single Track 60 Miles on the Erie 1.1 MB

Auburn, IA 1

1951	Automatic Block for Few Fast Trains 286.5 KB

Aurora, IL 1

1951	More Signal Construction in 1950 1.0 MB

automatic block signaling 9

1951	Automatic Block for Few Fast Trains 286.5 KB
1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	Circuits for Crossovers on the Baltimore & Ohio 215.2 KB
1951	Cut-Out Controls for Crossing Gates 488.0 KB
1951	More Signal Construction in 1950 1.0 MB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

automatic interlocking 1

1951	More Signal Construction in 1950 1.0 MB

automatic train control 2

1951	More Signal Construction in 1950 1.0 MB
1951	Pennsylvania Exhibits Speed Control 512.5 KB

automatic train stop 1

1951	More Signal Construction in 1950 1.0 MB

Baltimore & Ohio 12

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1951	B&O Installs Modern Interlocking 871.3 KB
1951	Circuits for Crossovers on the Baltimore & Ohio 215.2 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	More Signal Construction in 1950 1.0 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1951	Simple Interlocking Saves Many Train Stops 370.2 KB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1951	Street and Railroad Crossing Protection Combined 529.9 KB
1951	Traffic Direction Indication 152.0 KB

Bluefield, WV 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Bluestone, WV 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Bombay, Baroda & Central India 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

Bombay, India 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

Boston & Maine 4

1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1951	Double Track to Single With CTC 197.9 KB
1951	More Signal Construction in 1950 1.0 MB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Browns, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Buffalo, NH 1

1951	Double to Single Track 60 Miles on the Erie 1.1 MB

Buffalo, NY 3

1951	Double to Single Track 60 Miles on the Erie 1.1 MB
1951	Double Track to Single With CTC 197.9 KB
1951	More Signal Construction in 1950 1.0 MB

cab signaling 3

1951	Cab signal system 455.8 KB
1951	More Signal Construction in 1950 1.0 MB
1951	Pennsylvania Exhibits Speed Control 512.5 KB

call-on signals 2

1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	P&LE Rebuilds Interlocking 957.2 KB

Canadian National 1

1951	Canadian National Installs Centralized Traffic Control On a 117-Mile Sub-Division 501.4 KB

Canadian Pacific 1

1951	More Signal Construction in 1950 1.0 MB

carrier control 2

1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	Signal Modernization Program on the RF&P 1.0 MB

Carroll, IA 1

1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

Central of New Jersey 1

1951	A History of Flashing-Light Crossing Signals- What They Are and Why 570.5 KB

centralized traffic contol 1

1951	Simple Interlocking Saves Many Train Stops 370.2 KB

centralized traffic control 15

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	Canadian National Installs Centralized Traffic Control On a 117-Mile Sub-Division 501.4 KB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1951	Double to Single Track 60 Miles on the Erie 1.1 MB
1951	Double Track to Single With CTC 197.9 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	More Signal Construction in 1950 1.0 MB
1951	P&WV Signals Entire Main Line 3.9 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1951	Signal Modernization Program on the RF&P 1.0 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1951	Traffic Direction Indication 152.0 KB
1951	What's the Answer? Stop Signals in CTC 274.3 KB

Chattanooga, TN 1

1951	Double Track to Single With CTC 197.9 KB

Chesapeake & Ohio 2

1951	Cut-Out Controls for Crossing Gates 488.0 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB

Cheyenne, WY 1

1951	More Signal Construction in 1950 1.0 MB

Chicago & Eastern Illinois 1

1951	Simple Interlocking Saves Many Train Stops 370.2 KB

Chicago & North Western 1

1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

Chicago Great Western 1

1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

Chicago South Shore & South Bend 1

1951	South Shore Line Records Gate Operations 375.1 KB

Chicago, Burlington & Quincy 4

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	More Signal Construction in 1950 1.0 MB
1951	What's the Answer? Stop Signals in CTC 274.3 KB

Chicago, IL 1

1951	More Signal Construction in 1950 1.0 MB

Chicago, Milwaukee, St. Paul & Pacific 3

1951	More Signal Construction in 1950 1.0 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB
1951	What's the Answer? Stop Signals in CTC 274.3 KB

Chicago, Rock Island & Pacific 2

1951	Automatic Block for Few Fast Trains 286.5 KB
1951	What's the Answer? Stop Signals in CTC 274.3 KB

Cincinnati, OH 1

1951	B&O Installs Modern Interlocking 871.3 KB

coded track circuits 6

1951	Automatic Block for Few Fast Trains 286.5 KB
1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	Cab signal system 455.8 KB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB

color light signaling 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

color light signals 1

1951	Simple Interlocking Saves Many Train Stops 370.2 KB

color position light signals 3

1951	B&O Installs Modern Interlocking 871.3 KB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	Simple Interlocking Saves Many Train Stops 370.2 KB

Concord, MA 1

1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB

Concord, NH 1

1951	Double Track to Single With CTC 197.9 KB

Connellsville, PA 1

1951	P&WV Signals Entire Main Line 3.9 MB

Corning Glass Center 1

1951	Glass Library and Museum 319.8 KB

Corning Glass Works 1

1951	Glass Library and Museum 319.8 KB

Corning, NY 1

1951	Glass Library and Museum 319.8 KB

Cortland, NY 1

1951	Automatic-Manual Control for Gates at Five Crossings 418.2 KB

crossing recorders 1

1951	South Shore Line Records Gate Operations 375.1 KB

crossing watchmen 1

1951	Automatic-Manual Control for Gates at Five Crossings 418.2 KB

Dayton Union 1

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB

Dayton, OH 1

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB

Delaware, Lackawanna & Western 1

1951	Automatic-Manual Control for Gates at Five Crossings 418.2 KB

Delmar, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Den Bosch 1

1951	New Interlocking in Holland 1.0 MB

desk lever interlocking 1

1951	Simple Interlocking Saves Many Train Stops 370.2 KB

Dove, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

dwarf signals 1

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB

East Chicago, IN 1

1951	South Shore Line Records Gate Operations 375.1 KB

East Newark Jct., NJ 1

1951	Pennsylvania Exhibits Speed Control 512.5 KB

electric interlocking 2

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB
1951	P&LE Rebuilds Interlocking 957.2 KB

electric switch locks 2

1951	Double to Single Track 60 Miles on the Erie 1.1 MB
1951	New Interlocking in Holland 1.0 MB

electrification 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

electro-pneumatic switches 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Erie 3

1951	Double to Single Track 60 Miles on the Erie 1.1 MB
1951	Double Track to Single With CTC 197.9 KB
1951	More Signal Construction in 1950 1.0 MB

false proceed failures 1

1951	ICC Bureau of Safety Report 740.4 KB

false restrictive failures 1

1951	ICC Bureau of Safety Report 740.4 KB

flashing light signals 1

1951	A History of Flashing-Light Crossing Signals- What They Are and Why 570.5 KB

Ft. Plain, NY 1

1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB

Gays, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

General Railway Signal 16

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1951	B&O Installs Modern Interlocking 871.3 KB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	Cab signal system 455.8 KB
1951	Canadian National Installs Centralized Traffic Control On a 117-Mile Sub-Division 501.4 KB
1951	New Interlocking in Holland 1.0 MB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB
1951	Simple Interlocking Saves Many Train Stops 370.2 KB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB
1951	Street and Railroad Crossing Protection Combined 529.9 KB

Glass Library and Museum 1

1951	Glass Library and Museum 319.8 KB

Grafton, WV 1

1951	More Signal Construction in 1950 1.0 MB

Grand Island, NE 1

1951	More Signal Construction in 1950 1.0 MB

Green Island, IA 2

1951	More Signal Construction in 1950 1.0 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Griswold Signal 1

1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

Hagerstown, MD 1

1951	Modern Interlocking on the Norfolk & Western 710.2 KB

Hammond, IN 1

1951	South Shore Line Records Gate Operations 375.1 KB

hand-throw crossivers 1

1951	Circuits for Crossovers on the Baltimore & Ohio 215.2 KB

Harrison, NJ 1

1951	Pennsylvania Exhibits Speed Control 512.5 KB

Henderson, KY 1

1951	More Signal Construction in 1950 1.0 MB

high-speed turnouts 1

1951	Signal Modernization Program on the RF&P 1.0 MB

highway crossings 11

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1951	A History of Flashing-Light Crossing Signals- What They Are and Why 570.5 KB
1951	Automatic-Manual Control for Gates at Five Crossings 418.2 KB
1951	Cut-Out Controls for Crossing Gates 488.0 KB
1951	More Signal Construction in 1950 1.0 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB
1951	South Shore Line Records Gate Operations 375.1 KB
1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB
1951	Street and Railroad Crossing Protection Combined 529.9 KB

hold-out signal 1

1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB

hold-out signals 1

1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

Illinois Central 2

1951	More Signal Construction in 1950 1.0 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

index 1

1951	1951 index 4.8 MB

Indianapolis, IN 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

interlocking 13

1951	B&O Installs Modern Interlocking 871.3 KB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	More Signal Construction in 1950 1.0 MB
1951	New Interlocking in Holland 1.0 MB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1951	Simple Interlocking Saves Many Train Stops 370.2 KB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Interstate Commerce Commission 1

1951	ICC Bureau of Safety Report 740.4 KB

Ivorydale Jct., OH 1

1951	B&O Installs Modern Interlocking 871.3 KB

junction indicators 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

Kansas City Southern 2

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB

Kansas City Terminal 1

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB

Kansas City, MO 2

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB

Karl, Mattoon, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Knoxville, TN 1

1951	More Signal Construction in 1950 1.0 MB

La Porte, IA 1

1951	Automatic Block for Few Fast Trains 286.5 KB

Lost Nation, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Louisville & Nashville 1

1951	More Signal Construction in 1950 1.0 MB

Maine Central 1

1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Maine Public Utility Commission 1

1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Manchester, NH 1

1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB

Manly, IA 1

1951	Automatic Block for Few Fast Trains 286.5 KB

Marion, IA 2

1951	More Signal Construction in 1950 1.0 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Markham, IL 1

1951	More Signal Construction in 1950 1.0 MB

Martelle, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Mattoon, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

McKees Rocks, PA 1

1951	P&LE Rebuilds Interlocking 957.2 KB

McKeesport, PA 1

1951	P&LE Rebuilds Interlocking 957.2 KB

mechanical interlocking 4

1951	B&O Installs Modern Interlocking 871.3 KB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	More Signal Construction in 1950 1.0 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Moberly, MO 1

1951	Wabash Installs Yard Communication System 1.2 MB

Montreal, Quebec 1

1951	More Signal Construction in 1950 1.0 MB

motor car indicators 1

1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

motor car protection 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Moulton, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Mount Pleasant, IA 1

1951	More Signal Construction in 1950 1.0 MB

movable bridge 1

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB

Mumbai, India 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

Nashua, NH 2

1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1951	Double Track to Single With CTC 197.9 KB

Netherlands 1

1951	New Interlocking in Holland 1.0 MB

New Castle, PA 1

1951	P&LE Rebuilds Interlocking 957.2 KB

New Delhi, India 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

New York Central 5

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1951	B&O Installs Modern Interlocking 871.3 KB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1951	What's the Answer? Stop Signals in CTC 274.3 KB

New York, Chicago & St. Louis 1

1951	Street and Railroad Crossing Protection Combined 529.9 KB

Newark, NJ 1

1951	Pennsylvania Exhibits Speed Control 512.5 KB

Nickel Plate 1

1951	Street and Railroad Crossing Protection Combined 529.9 KB

Norfolk & Western 3

1951	B&O Installs Modern Interlocking 871.3 KB
1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB

North Dayton, OH 1

1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB

North Platte, NE 1

1951	More Signal Construction in 1950 1.0 MB

Olin, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Omaha, NE 1

1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB

Oskaloosa, MO 1

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB

Oxford Jct., IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Pana, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Paralta, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Parkersburg, WV 1

1951	More Signal Construction in 1950 1.0 MB

Pennsylvania 7

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1951	B&O Installs Modern Interlocking 871.3 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	Pennsylvania Exhibits Speed Control 512.5 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1951	Simple Interlocking Saves Many Train Stops 370.2 KB
1951	Street and Railroad Crossing Protection Combined 529.9 KB

Pittsburg, KS 1

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB

Pittsburgh & Lake Erie 1

1951	P&LE Rebuilds Interlocking 957.2 KB

Pittsburgh & West Virginia 1

1951	P&WV Signals Entire Main Line 3.9 MB

Pittsburgh Jct., OH 1

1951	P&WV Signals Entire Main Line 3.9 MB

Pittsburgh, PA 1

1951	P&LE Rebuilds Interlocking 957.2 KB

plug-in relays 2

1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB

Portage, NY 2

1951	Double Track to Single With CTC 197.9 KB
1951	More Signal Construction in 1950 1.0 MB

Porter, L. B. 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Portland Terminal 1

1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Portland, ME 1

1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Portland, OR 1

1951	More Signal Construction in 1950 1.0 MB

position light signals 1

1951	P&LE Rebuilds Interlocking 957.2 KB

Potomac Yard, Alexandria, VA 1

1951	Signal Modernization Program on the RF&P 1.0 MB

power switch machines 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

power switches 2

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

Powhatan, WV 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Prescott, WI 1

1951	More Signal Construction in 1950 1.0 MB

Pueblo, CO 1

1951	More Signal Construction in 1950 1.0 MB

Ravenna, NE 1

1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB

Richmond, Fredericksburg & Potomac 1

1951	Signal Modernization Program on the RF&P 1.0 MB

Richmond, VA 1

1951	Signal Modernization Program on the RF&P 1.0 MB

River Jct., NY 1

1951	Double to Single Track 60 Miles on the Erie 1.1 MB

Roanoke, VA 1

1951	Modern Interlocking on the Norfolk & Western 710.2 KB

rock slide detectors 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Rook, PA 1

1951	P&WV Signals Entire Main Line 3.9 MB

route interlocking 3

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	New Interlocking in Holland 1.0 MB
1951	New NYC Interlocking Controlled by Synchrostep 1.2 MB

Rushville, IN 1

1951	Street and Railroad Crossing Protection Combined 529.9 KB

Saxby & Farmer 1

1951	Pennsylvania Exhibits Speed Control 512.5 KB

Schwendt, B. J. 1

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB

Seaboard Air Line 1

1951	Signal Modernization Program on the RF&P 1.0 MB

searchlight signals 5

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1951	New Interlocking in Holland 1.0 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

semaphore signals 3

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

semi-automatic interlocking 1

1951	Street and Railroad Crossing Protection Combined 529.9 KB

signal construction 1

1951	More Signal Construction in 1950 1.0 MB

Somerville, MA 1

1951	Glass Library and Museum 319.8 KB

Southern 3

1951	Double Track to Single With CTC 197.9 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	More Signal Construction in 1950 1.0 MB

speed selection 1

1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

spring switches 5

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1951	Burlington Simplifies CTC for Light-Traffic Single Track 1.7 MB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1951	P&WV Signals Entire Main Line 3.9 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

Springfield, MO 1

1951	More Signal Construction in 1950 1.0 MB

St. Louis, MO 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

St. Louis-San Francisco 1

1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

station overlaps 1

1951	Automatic Block Without Line Wires on the Kansas City Southern 723.0 KB

Ste. Rosalie, Quebec 1

1951	Canadian National Installs Centralized Traffic Control On a 117-Mile Sub-Division 501.4 KB

stop indication 1

1951	What's the Answer? Stop Signals in CTC 274.3 KB

take-siding indicator 1

1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB

The Dalles, OR 1

1951	More Signal Construction in 1950 1.0 MB

Tower A, Omaha, NE 1

1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB

Tower Hill, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

track circuits 1

1951	South Shore Line Records Gate Operations 375.1 KB

traffic direction indication 1

1951	Traffic Direction Indication 152.0 KB

train listener 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

tunnel fans 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

Union Pacific 3

1951	More Signal Construction in 1950 1.0 MB
1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB
1951	Traffic Direction Indication 152.0 KB

Union Switch & Signal 13

1951	A History of Flashing-Light Crossing Signals- What They Are and Why 570.5 KB
1951	Automatic Block for Few Fast Trains 286.5 KB
1951	Automatic-Manual Control for Gates at Five Crossings 418.2 KB
1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB
1951	Modern Interlocking on the Norfolk & Western 710.2 KB
1951	P&LE Rebuilds Interlocking 957.2 KB
1951	Pennsylvania Exhibits Speed Control 512.5 KB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB
1951	Signal Modernization Program on the RF&P 1.0 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB
1951	Special Protection Problems Solved With Gates and Flashers 1.5 MB

Ustick, MO 1

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB

Vincennes, IN 1

1951	Simple Interlocking Saves Many Train Stops 370.2 KB

Vinton, IA 1

1951	Automatic Block for Few Fast Trains 286.5 KB

Wabash 1

1951	Wabash Installs Yard Communication System 1.2 MB

Washington, DC 1

1951	Signal Modernization Program on the RF&P 1.0 MB

wayside signaling 1

1951	Pennsylvania Exhibits Speed Control 512.5 KB

West Jct., Quebec 1

1951	Canadian National Installs Centralized Traffic Control On a 117-Mile Sub-Division 501.4 KB

Western Maryland 1

1951	Modern Interlocking on the Norfolk & Western 710.2 KB

Western Railroad Supply 3

1951	"Central" Increases Safety at Highway Crossings in Dayton 1.0 MB
1951	On the Baltimore & Ohio New Interlocking Speeds Trains 641.0 KB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

wheel counter 1

1951	Remote Control Interlocking Coordinates Train Movements 922.4 KB

wigwag signals 1

1951	A History of Flashing-Light Crossing Signals- What They Are and Why 570.5 KB

Willow Springs, MO 1

1951	More Signal Construction in 1950 1.0 MB

Windsor, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Winston-Salem Southbound 1

1951	Modern Interlocking on the Norfolk & Western 710.2 KB

yard communication system 1

1951	Wabash Installs Yard Communication System 1.2 MB

Railway Signaling: 1951

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