The Rocky Mountaineer engines share the Union Pacific's 36th Street Yard in Denver, Colorado.

A line of BNSF heavy motors runs through the servicing island at the engine facility in Denver, Colorado.

BNSF 1899 (SD40-2) brings a freight to Denver on the Greeley Sub.

UP 1826 SD40N moves past a trio of BNSF motors sitting in the Union Pacific North Yard.

UPY 453 (which is a former Missouri Pacific SD40-2 converted to a slug by removing the prime motor) is spotted in the North Yard in Denver, Colorado.

BNSF 1590 (SD40-2) runs long hood forward and drags some stack cars to the yard in Denver, Colorado.

UP 5640 (ES44AC) joins a mix of light and heavy power in the Union Pacific's North Yard in Denver, Colorado.

UP 8640 (SD70ACe) gets repositioned in the Union Pacific's North Yard in Denver, Colorado.

BNSF 3127 (GP50) waits in the engine servicing yard for its turn in the Denver Yard. Also visible is the special cars for fighting fires along the tracks. These were not needed this year, thankf... (more)

UP 845 (GP38-2) is getting covered in thick snow from a winter storm that has blanketed the Colorado Front Range.

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

The California Zephyr runs under the Park Avenue Viaduct as it leaves Downtown 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.

Heavy snow falls in the Union Pacific's North Yard as a crew member of UP 700 (GP38N) gets ready to throw a switch.

UP 712 (GP38-2) waits for a run to the sand and fuel island in the North Yard in Denver, Colorado.