When I first saw UP 9603 through the viewfinder, I was a bit surprised as I was pretty sure this fell in the number range of the few C44-9Ws that UP has on the roster. I wondered what a DC unit was doing on an oil train. Then, I noticed the cabinet behind the cab on the conductor's side. That long cabinet is where the DC/AC power inverters are located. Turns out this unit is a rebuild! It was originally a C44-9W, rebuilt as a C44ACM. In fact, this unit was originally SP 8139.
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