UP 7104 (AC4400CW) leads an oil can train through Big Ten Curve as it heads down the Moffat Tunnel Sub towards Denver, Colorado.

UP 7104 (AC4400CW) leads an oil train down the hill from Tunnel #1 at Plainview, Colorado.

UP 7104 (AC4400CW) exits Tunnel #1 at Plainview, Colorado with a crewman on the front deck.

Light snow is falling in the valley of Crescent, Colorado as UP 7104 (AC4400CW) leads an oil can train south on the Moffat Tunnel Sub.

UP run-through power rolls westbound NS train 15M over Elk Creek at Lake City PA. 3-11-2023

Used and refurbished traction motors line the floor, waiting to be installed in a General Electric locomotive or sent out for a rebuild, at Union Pacific’s South Morrill Locomotive Facility on S... (more)

Not quite sure what happened to UP 7104, but by the looks of it, it cannot be good.

An eastbound loaded coal train fights the pull of gravity as it slowly descends out of Tunnel 10, past the clearing where Tunnel 9 stood until it was daylighted.

A big GE AC leads a long, empty vehicle train up the 1.0 percent grade between Bosque and Shawmut.