passenger mile

Pas´sen`ger mile

1.

(Railroads) A unit of measurement of the passenger transportation performed by a railroad during a given period, usually a year, the total of which consists of the sum of the miles traversed by all the passengers on the road in the period in question.

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One passenger transported one mile. For air and ocean transport, use nautical miles; for rail, highway, and inland waterway transport in the continental United States, use statute miles.