Searchlight type automatic block signals installed by Boston and Maine Railroad, on 17 mi of double track main line between Tower A in Boston Mass, and Silver Lake, Mass, to replace 2-arm lower quadrant semaphores; traffic conditions; 2-coil searchlight signal; wires on terminal board; new circuits developed; light-out relays; power distribution and battery supply; arresters and terminals; etc.


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    Title :

    Boston and Maine replaces semaphores with light signals


    Additional title:

    Ry Signaling


    Published in:

    Publication date :

    1942


    Size :

    5 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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