A first system includes the prime mover power system that provides power to the traction motors, while a second system provides power for so-called auxiliary electrical systems (or simply auxiliaries). A diesel engine (not shown) drives the prime mover power source 102 (e.g., an alternator and rectifier), as well as any auxiliary alternators (not shown) used to power various auxiliary electrical subsystems such as, for example, lighting, air conditioning/heating, blower drives, radiator fan drives, control battery chargers, field exciters, and the like. The auxiliary power system may also receive power from a separate axle driven generator. Auxiliary power may also be derived from the traction alternator of prime mover power source 102.