What is Head-end power?
'''Head-end power''' ('''HEP''') or '''Electric train supply''' ('''ETS''') is the [[electric power]] distribution system on a [[passenger train]]. The power source, usually a [[locomotive]] (or a generator car) at the front or 'head' of a train, provides the electricity used for heating, lighting, air conditioning, etc. {{transport-stub}} [[Category:Rail technologies]]