This unit was once an AC6000CW and sported a 16 cylinder prime mover with 6000 HP. When the high horsepower craze of late 1990s and early 2000s died off, UP converted their AC6000CWs to basically just be AC4400CWs with 12 cylinders and 4400 HP. This is denoted in the units designation on the cab, "C44/60AC".
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