A UP yard crewman just started up the prime mover in SD40-2 #1957. It is taking several minutes for the unit to fully warm up and, as a result, a lot of white exhaust is currently being produced. Also of note in this shot in UP 1019, a GP60. For whatever reason, UP seems to utilize GP60s in California and Texas quite a bit. They don't show up in Colorado all that often.
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