Auxiliary power unit - APU of 3100hp Wdm3A /Wdg3A Alco locomotive.
This video shows the Apu- Auxiliary power unit operation, circuitry and engine view of 3100hp alco locomotive, these are updates in the rebuild locomotive,Due to avoid the fuel loss during goods movement,and the trains waiting at yards the Apu for locomotive is provided, this unit is combined with the microprocessor of locomotive ,above stipulated time of waiting time ,loco is automatically shutdown,if the is any abnormal activities sensed in APU or main engine, the loco is cranked automatically, Auxiliary power unit supplies air pressure for train brake system and battery charging of main engine ,during the shutdown period of main engine.
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