Term used to denote the orientation of a vehicle which may require identification of the direction it faces, e.g. a locomotive with a cab at one end only. Particularly applies to some types of multiple unit vehicles which are semi-permanently coupled and which must face the right way round to allow the correct electrical and pneumatic connections to be made. Handing is avoided by duplicating wiring and hoses on both sides at vehicle ends but gives rise to additional costs. Handing is also used to denote the location of different items of equipment on a vehicle or train.