Snow is falling over South Draw as the California Zephyr whips up the snow running towards Crescent, Colorado on the Moffat Tunnel Sub.

A wide-angle view of the engine servicing yard in Denver, Colorado offers a variety of motors waiting for service or assignments.

BNSF 2828 (GP39-2M) runs through the Broomfield siding as it leads a cut of wood cars to a client in Lafayette, Colorado.

BNSF 1733 (SD40-2) shuffles a cut of cars in the Denver Yard.

Executive Grinstein BNSF 9709 (SD70MAC) leaves Golden, Colorado as it heads to Denver with the Coors Beer Train.

Executive Grinstein BNSF 9709 (SD70MAC) leads the Coors Beer Train through the North Yard towards Denver, Colorado.

An eastbound freight led by BNSF 9072 (SD70ACe) meets the westbound California Zephyr #5 at Pinecliffe, Colorado.

BNSF 2828 (GP39-2M) leads the Buck Local in a push you-pull me configuration as it heads to clients in Lafayette, Colorado.

BNSF 5700 (ES44AC) whips up the snow as it leads the Provo train past Chemical, Colorado as it heads towards Denver.

BNSF 5700 (ES44AC) runs through Rocky, Colorado on its way to Denver on the Moffat Tunnel Sub.

Freezing temperatures and snow have frosted the trees in Coal Creek Canyon as BNSF 5700 (ES44AC) leads a freight towards Denver on the Moffat Tunnel Sub.

BNSF 2530 (GP39-3) moves a cut of wood cars to clients in Lafayette, Colorado.

BNSF 2530 (GP39-3) waits for orders to head to the yard in Longmont, Colorado for an assignment.

BNSF 1733 (SD40-2) pulls a cut of cars over the South Platte River in Denver, Colorado.

BNSF 2549 (ex AT&SF GP39-3) waits for orders to move a cut of oil cans at the refineries in Commerce City.