| UPRR 3985, 844, and 6936, Part 2 of 2 The 2005 edition of the Denver Post Cheyenne Frontier Days Steam Special had some problems that transformed it into a unique opportunity for railfan photographers. It started out from Denver, CO, as planned, behind UP Challenger 3985 and the recently rebuilt Northern 844. But the 3985 was taken off the train at Fort Lupton due to mechanical problems, and the 844 handled it solo to LaSalle where three diesel units were added "just in case." Returning from Greeley, the 844 was backed up by DD40X 6939. Tags: 844 3985 6936 Challenger doubleheader locomotive railfan railroad railway steam train UP |