A shiny BNSF 7788 (ES44DC) heads to the Denver Yard and will lash up to a coal train heading south.

A single Union Pacific SD70M leads an officer's special as it races to Denver in advance of developing storm clouds.

UP 4404 (SD70M) leaves storm clouds behind as it runs towards Denver, Colorado with an officer's special passenger train.

Denver Rock Island Railroad #1083 (SW1500) pulls a cut of cars across the road in the industrial area known as The Stockyards.

A WWII Sherman tank watches over the Denver Rock Island Railroad's SW1500 as it heads back to their shop in central Denver, Colorado.

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

UP 700 (GP38N) works the North Yard in Denver, Colorado during a heavy snow storm.

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

191 on a winter's night .

Polar Express at the Colorado Railroad Museum

BNSF 2712 GP39-2 joins a mix of light and heavy power waiting for servicing or assignments at the engine facility in Denver, Colorado.

BNSF 7731 meets UPY 625 in the Union Pacific's North Yard in Denver, Colorado.

A four unit set of black & gray SD-9's C&S 829, 824, 830 and FW&D 850 with a southbound freight running on the Colorado & Southern near Denver on January 22, 1969. Photo by Ken Crist, from my co... (more)

The BNSF visits the Union Pacific's North Yard in Denver, Colorado. UPY 453 is a SD40-2 converted to a slug by removing the prime motor. It is paired with a specific motor (UPY 353) as it works ... (more)

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