The California Zephyr runs through the BNSF's Denver Yard as it heads towards the Union Station terminal in downtown Denver.

BNSF 9375 (SD70ACe) muscles a coal train through Monument, Colorado on the Joint Line.

BNSF 2530 (GP39-3) delivers a load of lumber to a customer in Lafeyette, Colorado.

BNSF 7474 (ES44DC) leads a freight west on the Brush Sub towards Denver. It looks like it spent a day or two in deep snow in Nebraska.

BNSF 7474 (ES44DC) leads a freight over a bridge in Hudson, Colorado as it runs west towards Denver on the Brush Sub.

A crewman from Hudson Terminal Railroad's #646 (Alco S1) throws a switch in the yard where the engine will sort tank cars.

The Amtrak Winter Park Express Ski Train passes by the Union Pacific's North Yard in Denver, Colorado as a Colorado sunrise provides a colorful sky.

The California Zephyr winds its way through the BNSF's Denver Yard as it heads towards Denver's Union Station.

The California Zephyr runs on the Brush Sub through West Tonville as it heads to Denver, Colorado.

Kansas City Southern #4709 (ES44AC) leads a grain train south on the Joint Line through Larkspur, Colorado.

BNSF 9017 (SD70ACe) runs the S curves leading to Palmer Lake on the Joint Line.

BNSF 9017 (SD70ACe) leads a loaded coal train south on the Joint Line through Monument, Colorado.

BNSF 9017 (SD70ACe) leads a coal train through Greenland, Colorado on the Joint Line.

BNSF 2530 (GP39-3) leads a short freight towards Broomfield on the Front Range Sub.

UP 845 (GP38-2) works the Union Pacific's North Yard in Denver, Colorado.