UP 3912 (SD70M) gets ready to head into the North Yard and a waiting train.

The Union Pacific yard team on UP 801 (GP38-2) give a friendly wave as they head into the North Yard in Denver, Colorado.

Union Pacific EMD SD40N (rebuilt SD40-2) No. 1826 has some work done in the Diesel House at the railroad’s former Rio Grande Burnham Shops on December 17, 2015.

RTD 4048 (Hyundai Eagle P3) runs towards Denver International Airport and will soon deliver another train load of passengers from Union Station in downtown Denver, Colorado.

UP 4403 (SD70M) joins a variety of light and heavy power as they wait for service or assignment in the Union Pacific's North Yard in Denver, Colorado.

The California Zephyr backs into Denver Union Station between the catenaries that support the RTD commuter rail trains that also serve the station.

BNSF 1879 (SD39-2) waits for servicing at the BNSF engine facility in Denver, CO. It was built in 1979 for the Atchison Topeka and Santa Fe.

Siemens Amtrak engine 301 (ALC-42 Charger) sits beyond the platform as tonight's California Zephyr 6 train was too long to fit into Denver's Union Station. There were 4 charger engines and extra ... (more)

The Moffat Line is busy as three UP trains line up to take their trains into the Colorado Rocky Mountains.

BNSF Bluebonnet 2854 (GP39-2) still looks great in the original AT&SF paint.

A bright looking Warbonnet sits at the engine servicing facility in Denver, Colorado.

The paint on the 700 series Warbonnets still looks good. Here BNSF 755 (Dash 9) waits for a green to take a freight south on the Joint Line from Denver to Pueblo, Colorado.

UP 7233 (AC4400CW) and two mates move into the North Yard towards a waiting train.

UPY 691 (GP15-1) muscles a cut of cars into the North Yard ladder.

UPY 691 (GP15-1) moves out a cut of oil tank cars from the fueling station at the North Yard in Denver, Colorado.