Definitions for "Unit Train"
A consist of freight cars, usually dedicated to a single commodity and/or origin and destination, which customarily is not broken-up except for special maintenance work on a component. (For passenger trains, see "Train Set.")
Trains of great length providing single-product, non-stop service in one direction to a major terminal.
A train comprising a specified number of railcars that remain together as a unit until reaching a designated destination.