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The Invention of the Track Circuit
American Railway Association
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SWITCH AND DRAW-BRIDGE SIGNALS.
If a switch or draw-bridge is misplaced an approaching train will set an alarm ringing at the station and will also exhibit a red signal ahead of the train as a warning to the engineer that the switch is misplaced.
The following heading and sections are photographic reproductions of parts of a circular issued by Mr. Robinson at the time of its date, "September, 1872."
It will be observed that certain of these sections are the same as above reproduced from the circular of 1870.
It will be noted also that the description of the system begun after the heading is not here completed, for. . . Read More
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