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American Heritage dict.
(train: a series of connected railroad cars pulled or pushed by one or more locomotives)
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Railway Age's comprehensive railroad dict., 2002
(train: An engine or more than one engine coupled, with or without cars, displaying markers. For practical purposes, a train is a group of coupled cars hauled by a locomotive)
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Random House dict.
(train: a self-propelled, connected group of rolling stock)
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Transportation research thesaurus, Web site, July 13, 2006
(Railroad trains; BT Vehicles)