Union Pacific GE AC4400CW No. 6433 has its third axle/traction motor assembly replaced, as it slowly is lowered in the drop pit and carefully watched by a machinist and an electrician. The locomot... (more)

A welder makes repairs to the plow on Union Pacific GE AC4400CW No. 6344 inside the Diesel House at UP’s Burnham Shops at Denver, Colorado, on the evening of December 8, 2015.

UP 6344 brings up the rear of an eastbound 218 car manifest.

UP 6344, a patched and re-numbered SP AC4400CW, leads an empty coal train at Mojave as they make a 20-odd car pickup out of the Mojave yard.