The Denver Rock Island Railroad's SW1500 crosses the South Platte River and heads back to the yard in the Denver Stockyards.

The Denver Rock Island Railroad's SW1500 pulls a cut of cars across a street and towards the BNSF main line where they will be taken to Denver.

The California Zephyr begins the climb into the Colorado Rocky Mountains, starting in Coal Creek Canyon.

I would guess that UP 4392 (SD70M) has relocated to Denver from California, as there is not a foot of the engine that has escaped being tagged with graffiti.

BNSF 2697 (GP35) sits in the yard in Golden, Colorado until it gets the call of action to take the Coors beer train to Denver.

BNSF 7365 (ES44DC) leads a stack train towards Hudson, Colorado on the Brush Sub.

Amtrak engine #192 (P42DC) leads the California Zephyr through Coal Creek Canyon, Colorado on the Moffat Tunnel Sub.

A Ferromex visitor from down south holds station at the BNSF engine servicing facility in downtown Denver, Colorado.

BNSF 9007 (SD70ACe) muscles a coal train into the yard in Downtown Denver, Colorado. A viaduct which spans the yard provides a great vantage point for watching BNSF yard operations.

A trio of BNSF light power get ready to head to the Denver Yard after being serviced at the downtown engine facility.

BNSF 2371 (GP38-2) pulls a cut of cars out of the Denver Yard over the South Platte River in downtown Denver.

BNSF 1729 (SD40-2) works the yard in Denver, Colorado.

BNSF 2549 (GP39-3) waits for an assignment at the BNSF engine servicing facility in Denver, Colorado.

BNSF 1749 (SD40-2) shuffles a cut of cars back into the ladders in the yard at Denver, Colorado.

A gaggle of light power works sorting freight cars in the Union Pacific's North Yard in Denver, Colorado.