Details of all relay interlocking installed at Willbridge, Ore, by Spokane, Portland and Seattle Railroad; previous arrangement at junction; tower building, interlocking machine, searchlight signals, switch machines, interlocking controls, power supply and track circuit connections described.


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    Title :

    S.P. and S. Installs all-relay interlocking


    Additional title:

    Ry Signaling


    Published in:

    Publication date :

    1946


    Size :

    3 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English