A bidirectional material source vehicle including a base unit and at least one material gathering device. The base unit is movable in a first travel direction and a generally opposite second travel direction. The at least one material gathering device is carried by the base unit. The at least one material gathering device is positioned at a first end of the base unit when the base unit is traveling in the first travel direction, and is positioned at a second end of the base unit when the base unit is traveling in the second travel direction.
