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.
16th Street (NYC), Chicago, IL 1
21st Street, Chicago, IL 1
1929 1
1929 index
7.4 MB
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Abbott, IL 1
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Spring Switches on Illinois Central
415.8 KB
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accident 1
Arenzville, IL 1
Atchison, Topeka & Santa Fe 3
Atlantic Coast Line 2
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Mechanical Selector for Interlocker
361.4 KB
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Rear-End Flagging
745.4 KB
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Aurora, IL 1
Baltimore & Ohio 3
Belt Line Jct., Detroit, MI 1
Boston & Maine 1
Boston, MA 1
Bristol, IL 1
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Spring Switches on Illinois Central
415.8 KB
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Bristow, OK 1
centralized traffic control 1
Chesapeake & Ohio 3
Chicago & Alton 3
Chicago & Eastern Illinois 1
Chicago & North Western 5
Chicago South Shore & South Bend 3
Chicago, Burlington & Quincy 4
Chicago, IL 3
Chicago, Indianapolis & Louisville 1
Chicago, Milwaukee, St. Paul & Pacific 2
Chicago, Rock Island & Pacific 4
Cleveland Union Terminal 1
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Elimination of Lock Rods
947.9 KB
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Cleveland, Cincinnati, Chicago & St. Louis 3
Concord, IL 1
Dayton, OH 1
Deen, CO 1
Delavan, IL 1
Denver & Rio Grande Western 3
derails 1
desk lever interlocking 1
Detroit, MI 1
Deutsche Reichsbahn 1
drawbridge 1
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Trap Circuit for Drawbridge
980.8 KB
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Duck Creek, WI 1
East St. Louis, IL 1
electric interlocking 1
Foster, OH 1
Gary, IN 1
General Railway Signal 1
Gibbs, IL 1
Grafton, WV 1
Grand Trunk Western 1
Green Bay, WI 1
Greensburg, IN 1
Hammond, IN 1
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Trap Circuit for Drawbridge
980.8 KB
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highway crossings 2
Hoosac Tunnel, MA 1
Horace, IN 1
Hot Springs, AR 1
Hoxie, AR 1
Illinois Central 1
index 1
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1929 index
7.4 MB
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indication locking 1
Institution of Railway Signal Engineers 1
interlocking 5
Lancaster, PA 1
Lincoln, NE 1
Louisville & Nashville 1
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Rear-End Flagging
745.4 KB
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Louisville, KY 1
Manufacturers Railway 2
Mattoon, IL 1
Mazonia, IL 1
Meadville, PA 1
Michigan Central 2
Minneapolis, MN 1
Minturn, CO 1
Missouri Pacific 1
Model 2 electric interlocking 1
Nashville, Chattanooga & St. Louis 2
Netherlands 1
New Paris, OH 1
New York Central 6
New York, Chicago & St. Louis 2
Northern Pacific 3
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Mathematics of the A.C. Track Circuit
974.9 KB
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Rear-End Flagging
745.4 KB
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Where Should Grade Signals Be Installed?
1.2 MB
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Pana, IL 1
Parkersburg, WV 1
Pennsylvania 8
Pere Marquette 1
Rockford, IL 1
Salamanca, NY 1
Sapulpa, OK 1
Seaboard Air Line 2
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Marker Lights on Automatic Signals
994.2 KB
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Rear-End Flagging
745.4 KB
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signal glass 1
South Joliet, IL 1
spring switches 1
St. Louis, MO 1
St. Louis-San Francisco 2
Streator, IL 1
Tennessee Pass 1
Terre Haute, IN 1
Thayer, MO 1
track circuits 1
train control 3
Troy, NY 1
Tulsa, OK 1
Union Switch & Signal 5
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"Union" Clock-Work Time Release
611.8 KB
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"Union" Thermal Relay
1.0 MB
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A Time-Element Relay
572.7 KB
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US&S float
512.3 KB
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What Is the Future of Train Control?
1.8 MB
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