= Gross ton mile
{wiki=Gross_ton_mile}
Gross ton mile is a unit of measurement used in the shipping and transportation industries to quantify the total transport work performed by a vessel or other freight-carrying vehicles. It reflects the movement of one gross ton of cargo over one mile. A gross ton is a measure of the overall internal volume of a ship, where one gross ton is equivalent to 100 cubic feet. Therefore, gross ton miles combine the weight of the cargo being transported with the distance it is carried.
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