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Ever wounder whats behind that bludge behind the cab on EMD's

Why, its the traction motor blower. We are standing in the clean air cabnet of a SD40-2 where everything that needs air gets it from, The objects in the top left are the paper bag filters for the Prime mover, while the traction motor blower sits in the top center (the spider web looking opening), The diode end of the main alternator is at the bottom left of the photo.
cools it, due to the amperage those motors draw, they get very very hot in operation. The blower forces air via a set of duct work to cool them.

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