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Many semaphore signals, particularly distants, are or were worked by electric motors. These appear to be a circular lower portion with a shaft coming out bearing the operating crank. On top of this round bit is a rectangular box, which I assume contains part of the operating system. But no book in my collection describes the inner workings of these motors. Can anyone point me towards a source of information, please?
Regards,
John Webb
Regards,
John Webb