UP 1826 (SD40N) works the North Yard in Denver, Colorado.

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.

The crew of UP 1865 (long snoot SD40N) calls it a day after working the yard in LaSalle, Colorado.

UP 1817 (SD40N) and other light power sit in an echelon right formation in the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) sits in the North Yard next to the motors belonging to the Rocky Mountaineer. Also note the UP heritage Rio Grande SD70ACe sitting at the service island.

A nice variety of motors occupy the Union Pacific's North Yard in Denver, Colorado.

Heavy snow is falling fast as light power works the Union Pacific's North Yard in Denver, Colorado.

Heavy snow is falling as UP 1817 (SD40N) leads a three motor lash up as it heads to the North Yard in Denver, Colorado.

Heavy snow falls in the UP's North Yard, catching three light motors in an echelon formation as they each work a track.

UP 1826 (SD40N) moves a cut of hoppers for sorting in the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) passes three BNSF motors that are sitting in the Union Pacific's North Yard in Denver, Colorado.

Light power, including UP 1826 (SD40N) works the North Yard in Denver, Colorado.

UP 1997 (SD40N) and other light power wait in the Union Pacific's North Yard for assignments as heavies fuel and sand up at the servicing islands.

UP 1826 (SD40N) works the ladder in the North Yard in Denver, Colorado.