Abstract: A transporting device having an overhead track arrangement with straight sections, curved sections, crossing sections and switching sections. A track carriage is movably mounted on the track. A wheeled transport carriage unit moves over a floor surface and is releasably coupled to the track carriage. Structure is provided for effecting a desired movement of the track carriage through switching sections and crossing sections. The transport carriage unit has the drive mechanism thereon and essentially pushes and follows the guide offered by the cooperating track and track carriage.