Ballast specifications of 46 railroads, representing 74% of total line mileage in United States and Canada, have been reviewed by ballast subcommittee of American Railway Engineering Assn in order to determine degree of conformity with AREA recommended standards; summary of specifications for crushed stone ballast; summary of specifications for gravel ballast.


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    Title :

    Requirements for principal railroads


    Additional title:

    Rock Products


    Contributors:

    Published in:

    Rock Products ; 47 , n 7


    Publication date :

    1944


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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