Definitions for

**"Ton mile"**A unit of measurement of the freight transportation performed by a railroad during a given period, usually a year, the total of which consists of the sum of the products obtained by multiplying the aggregate weight of each shipment in tons during the given period by the number of miles for which it is carried.

The product of the distance that freight is hauled, measured in miles, and the weight of the cargo being hauled, measured in tons. Thus, moving one ton for one mile generates one ton mile.

A measure of output for freight transportation; reflects weight of shipment and the distance it is hauled; a multiplication of tons hauled by the distance traveled.