BNSF 9122 (SD70ACe) runs a loaded coal train past the refineries in Commerce City, Colorado.

The California Zephyr 6 train runs through Rollinsville, Colorado at sunset, which is casting a glinty glow on the side of the stainless steel cars.

The California Zephyr rounds the base of Blue Mountain as it heads into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

Heavy snow has fallen at Crescent, Colorado as the Winter Park Express runs west on the Moffat Tunnel Sub.

Snow is falling as DRGW 3011 (GP30) and a Galloping Goose hold sidings at the Colorado Railroad Museum.

Snow is falling as BNSF 5874 (ES44AC) joins a Warbonnet, a Norfolk Southern Pony and an Executive Grinstein while they wait for service at the engine facility in Denver, Colorado.

Sunrise catches BNSF 5973 (ES44AC) leading a long freight with heavy power through Tunnel #1 at Plainview, Colorado.

BNSF 2530 (GP39-3) climbs the grade on the Longmont Siding.

BNSF 2530 (GP39-3) runs though Louisville, Colorado with a short freight

BNSF 2530 (GP39-3) rounds the corner in Longmont, Colorado and will deliver a short train of wood to a customer.

BNSF 2530 (GP39-3) takes the siding in Longmont, Colorado and will move some wood cars to a client in Superior.

BNSF 2530 (GP39-3) rounds the corner at Burkes Hill in Louisville, Colorado.

Hudson Terminal Railroad's #646 (Alco S1) moves a cut of oil cans in the terminal at Hudson, Colorado.

A spectacular sunrise provides the background for RTD commuter train #4023 (Huyndai Eagle P3) as it runs the elevated section over the Union Pacific's 36 Street Yard in Denver, Colorado.

AMTK 10004 (Viewliner Inspection Car) provides Amtrak CEO Stephen Gardner a great view as the California Zephyr runs through Plainview on the Moffat Tunnel Sub.