This unit started life as an SD45-2 (note the length of the long hood). Not long ago, it went through a rebuild program and is now designated as an SD45-2R. The unit is essentially an SD40-2 (20-cylinder prime mover has been replaced with a 16-cylinder prime mover). Mote that the radiator fans have been replaced and no longer have the tell-tale gaps of the SD45-2. The radiator grill sill maintains its original length, giving the back of the unit a bit of an interesting look.
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