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.
1956 1
1956 index
2.8 MB
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"BY" Tower, Baltimore, MD 1
Aldine, IN 1
all-relay interlocking 1
approach locking 1
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CTC Locking
2.2 MB
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Aspen, WY 1
Atchison, Topeka & Santa Fe 11
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Conelrad – A Civil Defense Measure … How Some Railroads are Participating
4.1 MB
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CTC Signs
1.8 MB
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Gate Arm Stripes
1.3 MB
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Interlocking Relays
3.9 MB
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New Three-Track Interchange Includes Interlocking and Talk-Backs
8.9 MB
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No Waiting for Reservations
6.3 MB
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Photography
1.5 MB
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Release of Locking
3.7 MB
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Signal Lamp Test
1.4 MB
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Snow Melters
2.6 MB
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Training Program
2.1 MB
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Atlantic Coast Line 1
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Gates at 21 Crossings
6.6 MB
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Aurora, IL 1
automatic block signaling 3
automatic control 1
Bailey, Baltimore, MD 1
Baltimore & Ohio 2
Baltimore, MD 1
Baughman, George W. 1
broadcast radio 1
Bushnell, IL 1
call-on signals 1
Camden Station, Baltimore, MD 1
Canadian National 1
capacity 1
Carthage Jct., IL 1
center sidings 1
Centralia, IL 1
centralized traffic control 14
Chesapeake & Ohio 4
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Air Line Leak
1.1 MB
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Remote Control Converted to CTC
6.6 MB
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Signal Lamp Test
950.0 KB
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Switch Machines for CTC
985.3 KB
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Chicago & North Western 2
Chicago & Western Indiana 1
Chicago Great Western 1
Chicago Jct., Kansas City, MO 1
Chicago South Shore & South Bend 1
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Walkie-Talkies
1.5 MB
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Chicago Transit Authority 1
Chicago, Burlington & Quincy 7
Chicago, IL 2
Chicago, Milwaukee, St. Paul & Pacific 1
Chicago, Rock Island & Pacific 3
Cicero, IL 2
civil defense 1
code line 1
code line failure 2
color position light signals 1
Columbus, OH 1
communication 1
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Interlocking Phones
2.3 MB
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computerization 1
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No Waiting for Reservations
6.3 MB
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cut-over 1
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Interlocking Phones
2.3 MB
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Cutbank, MT 1
Delaware & Hudson 1
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Switch Machines for CTC
2.0 MB
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Douglas Park Line, Chicago, IL 1
dual-control 2
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Switch Machines for CTC
2.0 MB
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Switch Machines for CTC
985.3 KB
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East Haven, CT 1
electro-pneumatic interlocking 1
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Air Line Leak
1.1 MB
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electronics 1
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No Waiting for Reservations
6.3 MB
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Elkhart, IN 1
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Three Signal Shops into One
7.0 MB
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emergency drills 2
Erie 3
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Double to Single Track With CTC
7.4 MB
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Signal Lamp Test
1.4 MB
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Snow Melters
2.6 MB
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General Railway Signal 4
Grand Ave., St. Louis, MO 1
Gratiot St., St. Louis, MO 1
Great Northern 2
Griswold Signal 1
GRS TrafficMaster 1
Gulf, Mobile & Ohio 1
Hamburg St., Baltimore, MD 1
highway crossings 10
Houston, TX 1
Illinois Central 5
index 1
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1956 index
2.8 MB
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interlocking 8
interlocking consolidation 1
Johnston, Wayne A. 1
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The Crossing Accident Problem
986.5 KB
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Kansas City Southern 1
Kansas City Terminal 2
Kansas City, MO 1
letter 1
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The Crossing Accident Problem
986.5 KB
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lightweight trains 1
locking 1
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Release of Locking
3.7 MB
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Louisville & Nashville 1
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Walkie-Talkies
1.5 MB
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lunar white 1
McKinley Bridge, St. Louis, MO 1
Mill River, CT 1
Missouri & Illinois 1
Missouri Pacific 4
Missouri-Kansas-Texas 1
model boards 1
Morrison, IL 1
motor car indicators 1
New Haven, CT 1
New Rochelle, NY 1
New York Central 3
New York, Chicago & St. Louis 2
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Photography
1.5 MB
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Walkie-Talkies
1.5 MB
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New York, New Haven & Hartford 3
Norfolk & Western 1
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CTC Signs
1.8 MB
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North Haven, CT 1
NX interlocking 2
Pennsylvania 2
Pershing, IN 1
photography 1
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Photography
1.5 MB
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Quincy, IL 1
radio 3
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Train Operations When CTC Fails
3.5 MB
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Train Operations When CTC Fails
2.4 MB
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Walkie-Talkies
1.5 MB
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relays 1
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Interlocking Relays
3.9 MB
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remote control 1
reservations 1
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No Waiting for Reservations
6.3 MB
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route interlocking 1
Rye, NY 1
Santa Fe Jct., Kansas City, MO 1
Seaboard Air Line 1
searchlight signals 1
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Aligning Searchlight Signal
1.1 MB
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Shore Line Jct., CT 1
sidings 1
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Main Track Leaving Signal
2.2 MB
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signal lamps 2
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Signal Lamp Test
1.4 MB
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Signal Lamp Test
950.0 KB
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signal projects 1
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Photography
1.5 MB
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signal shop 1
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Three Signal Shops into One
7.0 MB
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signs 1
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CTC Signs
1.8 MB
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single-tracking 1
snow melters 1
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Snow Melters
2.6 MB
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South Chicago, IL 1
Southern 1
Southern Pacific 7
Spokane, WA 1
spring switches 1
St. Louis Southwestern 1
St. Louis, MO 2
St. Louis-San Francisco 7
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CTC Signs
1.8 MB
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Interlocking Phones
2.3 MB
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New Three-Track Interchange Includes Interlocking and Talk-Backs
8.9 MB
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NX Control Replaces Lever Machine
2.8 MB
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Release of Locking
3.7 MB
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Switch Machines for CTC
2.0 MB
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Walkie-Talkies
1.5 MB
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State Line interlocking 1
stick circuits 1
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Interlocking Relays
3.9 MB
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switch machines 2
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Switch Machines for CTC
2.0 MB
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Switch Machines for CTC
985.3 KB
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switchboards 1
Tampa, FL 1
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Gates at 21 Crossings
6.6 MB
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telegraph 1
Terminal Railroad Association of St. Louis 2
testing 2
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Signal Lamp Test
1.4 MB
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Signal Lamp Test
950.0 KB
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time locking 1
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CTC Locking
2.2 MB
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Toledo, OH 1
track circuits 2
training 1
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Training Program
2.1 MB
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tunnels 1
Union Pacific 4
Union Route interlocking 2
Union Switch & Signal 5
Virginian 1
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Release of Locking
3.7 MB
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Wabash 2
Wenatchee, WA 1
Western Pacific 2
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CTC Locking
2.2 MB
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Main Track Leaving Signal
2.2 MB
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Wheeling, WV 1
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B&O Crossings
4.3 MB
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