Abstract: The invention relates to the track-bound carrying out of works on a or for a railway track, such as earthworks, rail works, overhead wiring and signaling works, sleeper laying, sleeper replacement and the like, the devices (7-12) for carrying out the works forming a transport unit (15) or being accommodated in a transport unit (15) and the transport unit being detachably fastenable to a track vehicle (1), especially a railroad car.