On September 14, 2017, Union Pacific GE AC4400CW locomotives are repaired and overhauled at the South Morrill Locomotive Facility. On track 2, UP AC4400CW No. 6704 is having a new prime mover is installed, while over on Track 3, sister GE No 6444 is having its roof hatch surrounding the exhaust stack removed to access components needing attention.