train mile
noun
Definitions
A unit used in estimating railway running expenses, etc.: the total number of miles run by all the trains of a railroad, or system of railroads, as within a given time, or for a given expenditure.
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Definitions
A unit used in estimating railway running expenses, etc.: the total number of miles run by all the trains of a railroad, or system of railroads, as within a given time, or for a given expenditure.