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[quote]QUOTE: Originally posted by David_Telesha Anything with a MU system. [/quote] Although that is true (if somewhat flippant and rude), in actual practice, UP generally runs it's AC4400CW's on coal trains...the only other locomotives that routinely team up with the AC's in this kind of service are "SD9043AC"'s (UP's term for SD90MAC's with 4300 HP engines) and AC6000CW "convertibles" (similar in nature to the SD9043's, they are AC6000's with 4400 HP engines). There are always exceptions, of course. I have seen AC4400's in merchandise service (especially the CTE variants in the 5500-5999 series). Here in the St. Louis area, UP coal trains generally run with two locomotives pulling and one pushing. Variations observed (usually on empties) are one, two or three pulling and none pushing, one on each end and, rarely, one AC4400 pulling 135 empties. Most AC's are in UP paint, but those in original SP & CNW paint still appear, although most of those have been renumbered.
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