Handing

Nowadays synonymous withTerm used to denote the term parking brake but
originally orientation of a vehicle brake applied 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 hand action 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 wheel vehicle or lever on the vehicle. train.