Head end power car

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A China Railways KD25K generator car at Beijing Railway Station.

A head end power car is a rail car that supplies head end power (HEP). Since most modern locomotives supply HEP they are mostly used by heritage railways that use older locomotives, or by railroad museums that take their equipment on excursions.[1] Quite a few head end power cars started out as other forms of rolling stock that have been rebuilt with diesel generators and fuel tanks to supply HEP to the passenger equipment.[2][3]