A pair of GE AC4400CW's trail Union Pacific's Denver to Salt Lake City manifest through the Red Narrows of Spanish Fork Canyon. During the cooler months of the year, the UP runs manned helpers for dynamic braking on heavier trains between Soldier Summit and Castilla, Utah. This MNYRO was 143 cars long with three more AC units on the point. For the SP heritage fans, UP 6368 was built the SP 315 by GE in July 1995.
