Of the five remaining Class 1 railroads in the United States (so I'm not counting Canadian Pacific or Canadian National), I think CSX might be railroads whose engines make it to Colorado the least frequently. However, this AC6000CW just happened to come through on the BNSF Provo-Denver. CSX was the other railroad, along with UP, to give the 6000 HP units a shot. There are not many of these still roaming the rails!
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