Due to the way the Big Boys were built, it looks from this shot as though there is a pretty good gap between the Big Boy and the SD70M that is leading it. Regardless of how it may look, however, the two units are indeed coupled together. At this point, the public display of (both) UP 4014s was winding down. Twelve hours later, the train would depart to continue its journey to Cheyenne, WY.
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