Sunlight and snow showers greet UP 7788 (C45ACCTE) as it leads the Grand Junction-to-Denver train down the grade from Tunnel #1 at Plainview, Colorado on the Moffat Tunnel Sub.

Heavy snow blankets the Front Range as BNSF 1899 (SD40-2) leads a freight through a winter wonderland in Golden, Colorado.

BNSF 1899 (SD40-2) leads an oil can train past the refineries in Commerce City, Colorado.

A BNSF oil train passes the petroleum refineries in Commerce City as it heads to Denver, Colorado.

BNSF 1899 (SD40-2) heads to Denver on the Brush Sub, passing through Commerce City on the way.

BNSF 1899 (SD40-2) brings a freight to Denver on the Greeley Sub.

BNSF 1899 (SD40-2) leads a freight towards Denver, Colorado on the Brush Sub.

BNSF 1899 (SD40-2) gets ready to move a string of stack cars out of the intermodal facility in Denver, Colorado.

BNSF 1899 (SD40-2) runs past the UP's North Yard in Denver, Colorado.

BNSF 1899 (SD40-2) lashes up to a container train which it will take to the ready track and stage for the Z train.

BNSF 1899 (SD40-2) runs light towards the BNSF intermodal facility in Denver, Colorado where it will stage a container train.

BNSF 1899 SD40-2 waits for service at the BNSF engine servicing facility in downtown Denver.

BNSF 1899 (SD40-2) moves a cut of cars across the South Platte River as it works the Denver Yard.

BNSF 1899 (SD40-2) shuffles a cut of cars into the Denver Yard. You can find quite a few SD40-2's working the Denver Yard at any given time.

BNSF 1899 (SD40-2) works a cut of cars in the Denver Yard. Notice the added AC unit on the front of the cab.