A pair of old school Cascade Green Burlington Northern motors move a string of cars over the South Platte River in Denver, Colorado.

BNSF 2708 (GP39-2) lashes up to a string of heavy motors in the yard of the engine servicing facility.

On its inaugural run in 2019 after a lengthy restoration, Union Pacific Big Boy #4014 runs over a bridge at Sand Creek in Denver, Colorado during a heavy snowstorm.

UP 1357 (former Rio Grande GP40-2) runs into the North Yard in Denver, Colorado to sort cars.

A variety of light and heavy power wait for servicing at the North Yard in Denver, Colorado.

A pair of SD40-2's in fresh Heritage III paint work in the Denver yard sorting cars.

Former Santa Fe Bluebonnet #2854 (GP39-2) leads a freight over the South Platte River in Denver, Colorado.

One of these things is not like the others. BNSF 8435 (SD70ACe) sits at the service island in the Union Pacific's North Yard in Denver, Colorado.

BNSF 1984 (SD40-2) works a string of hoppers in the yard in downtown Denver, Colorado.

The Amtrak Winter Park Express leaves Denver, Colorado as a bright sunrise bathes the North Yard in a golden glow.

BNSF 2854, a former AT&SF GP39-2 still in its Bluebonnet paint, works the yard in downtown Denver, Colorado.

The Abominable Big Boy #4014 engine of the Union Pacific Railroad arrived in Denver to blue skies and warm weather in November of 2019, while making the inaugural run after a long restoration. On ... (more)

Dawn is breaking as the Amtrak's Winter Park Express Ski Train leaves the North Yard in Denver, Colorado and heads west towards the Colorado Rocky Mountains on the Moffat Tunnel Sub.

BNSF 1680 (SD40-2) moves to the servicing island to get fuel and sand and will head to the Denver Yard to shuffle rolling stock.

A pair of former Burlington Northern units (SD40-2 and GP39E) work the yard in downtown Denver, Colorado.