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All About Signals by John Armstrong special reprint
All About Signals by John Armstrong
A special reprint of articles for the June & July 1957 issues of trains.
Copyright 1957, 1975.
26 pages.
Because you can not steer a train, you must rely on the order board, the semaphore or the color light signal to provide the space between trains that is safety. Trains expert explains in easy steps the progress from crude but effective manual block safety to the speed insured by 1957s complexity of wires, relays, motors and lights. There are signals from A to Z.
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