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APU (Auxiliary Power Unit)

HOTSTART's diesel-powered locomotive heating system eliminates idling when a locomotive is shut down or put in layover where no electrical service is available. Operating independently of other locomotive systems, the HOTSTART APU circulates heated coolant through the engine, compressor, expansion tank, oil cooler and wet cab heater to keep the entire locomotive's water system warm during shutdowns. Depending on ambient temperature, the system will maintain the prime mover's coolant between 90-120°F while also maintaining the battery's full charge. The HOTSTART APU is small enough to fit in the nose of most locomotives as well as any car body or walkway.

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