Progress report on proper grinding of bonding drills; requisites for automatic block signaling circuits; new developments in methods of improving shunting of track circuits; improvements in sanding devices; voice pass filter, voice and type H pass filter, and voice and carrier pass filter for coded system control; selenium rectifiers; grounding of signal power supply transformers. (Signal Sec)


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    Title :

    Committee IV -- Automatic block signaling


    Additional title:

    Assn Am Railroads -- Advance Reports



    Publication date :

    1948


    Size :

    46 pages


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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