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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    Titel :

    Boston and Maine replaces semaphores with light signals


    Weitere Titelangaben:

    Ry Signaling


    Erschienen in:

    Erscheinungsdatum :

    1942


    Format / Umfang :

    5 pages


    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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    Engineering Index Backfile | 1925




    Semaphores replaced by color-light signals on 55 miles of I. C.

    Morgan, H.G. | Engineering Index Backfile | 1926