Demag Cranes & Components [India] Private Limited manufactures Driven Rail-Mounted Travel Units. Demag Cranes & Components [India] Private Limited is an ISO 9001 certified company. The Driven Rail-Mounted Travel Units features a rigid box girder profile, a driven DRS wheel block, to which a gearbox and motor are fitted, as well as a non-driven DRS wheel block. The Driven Rail-Mounted Travel Units are optimized for materials handling requirements: For travel applications for crane and hoist steelwork and related mechanical engineering structures.