Track layout and mechanical interlocking which has been in service for 46 yr on Boston and Maine replaced by modern electrical equipment and controls; illustrated description of dwarf signals, electric switch machines, panel type control machine, and switch circuits.


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    Title :

    Boston and Maine installs all-relay interlocking at Concord, N.H.


    Additional title:

    Ry Signaling


    Published in:

    Publication date :

    1945


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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