Amtrak engine #39 (P42DC) leads the California Zephyr through the Denver Yard as gets ready to back into Denver's Union Station.

UP 1652 (SD40-2) joins other light power waiting for servicing or orders in the North Yard in Denver, Colorado.

Denver RTD commuter train #4026 (Hyundai Eagle P3) leaves Denver and heads towards Arvada, Colorado.

BNSF 3171 (GP50) works a cut of cars in the large yard in Denver, Colorado.

BNSF 1600 (SD40-2) works the yard in downtown Denver, Colorado.

Ex-ATSF 5133 is one of the yard motors assigned in Denver.

UP 1957 (SD40N) works the North Yard in Denver, Colorado.

A visiting motor from the Rocky Mountaineer passenger train stands among the other UP motors in the North Yard in Denver, Colorado.

Light and heavy power line up for serving in the Union Pacific's North Yard in Denver, Colorado.

BNSF 7524 (ES44C4) leads a freight past an RTD commuter train as it heads north on the Front Range Sub.

UP 817 (GP38N) sits in the North Yard in Denver, Colorado.

There is a variety of light and heavy power in the Union Pacific's North Yard waiting for service or assignments.

Private Car PPCX 800724 (Promontory Point) is lashed up to the back of the California Zephyr as it backs into Denver's Union Station.

Running on the old Denver Post Frontier Days Special schedule, #4014 leads a passenger special from Denver to Cheyenne.

UP 6045 (AC4400CW-CTE) gets ready to lead the Officer's Train out of the North Yard in Denver, Colorado.