UP 801 (GP38-2) works the ladders in the North Yard in Denver, Colorado.

UP 1507 (GP40M) moves through the Union Pacific's North Yard in Denver, Colorado.

UP 6676 & 7355 power an eastbound loaded coal train.

UP 7177 brings up the rear of a westbound empty coal train.

A pair of GP15s is in charge of the Oskaloosa Local seen here headed south through Gilman, Iowa.

UP 3802 leads the LUE50 or LUE51 local on a Sunday afternoon at Stauffer, Utah.

A GP38-2 555 that was actually originally Union Pacific 2055. UP 555, 724 lead the Chevron local. Working the Chevron refinery.

UP 1817 (SD40N) sits in the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) pulls up to the yard crew who will board as head to the north end of the yard.

I think Alfred Hitchcock would have liked this photo. UP 1826 (SD40N) works the Union Pacific's North Yard in Denver, Colorado as hundreds of birds circle, waiting for the chance to land on the tr... (more)

A Union Pacific oil can train is seen from inside a rock formation at Crescent, Colorado.

It's the blue hour in Denver, Colorado as UP 6999 (AC4400CW) leads an oil can train towards the 36th Street Yard.

The snow is so deep that UP 8051 (ES44AC) pushes a wall of snow ahead of the train as it heads to Denver, Colorado on the Moffat Tunnel Sub.

UP 8051 (ES44AC) has emerged from the Moffat Tunnel into a heavy snow storm and will slowly lead an oil can train towards Denver, Colorado.

A solid set of Union Pacific power takes NS train 226 eastbound through Tallapoosa, GA on their way to Atlanta, GA. Train 226 originated in Shreveport, LA from the Union Pacific with a UP the symb... (more)