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APU, Auillary power unit. this is a small 4 cylinder diesel engine mounted on a chassis, along wiht a 25 KW 240V AC generator the purpose for this sevice is fuel conservation. this device combined with wabtecs engine run manager senses engine water temp, battery voltage, brake pipe and main res pressure <br />if any of these parameters arent what the ERM looks for it starts the APU up <br />the apu has heaters to heat the locomotive cooling system has a battery charger to charge the batterys and a small air compressor for your consist if the apu runs long enough and cannot build enough air charge the batterys enough or mainly warm the engine up to temp it will start a sequence where it actually primes and starts the main engine runs the main engine untill these parameters have been met then goes into auto shut down mode this is the alternative to letting them run 24/7 in the wintertime
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