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.

The cows are more interested in the photographer as the California Zephyr, led by Amtrak engine #82 in Phase VII paint, heads up Big Ten Curve at Rocky, Colorado.

Snow has blanketed Coal Creek Canyon as the California Zephyr runs towards Tunnel #1.

Amtrak engine #169 (P42DC) leads the California Zephyr through a sunny but snow packed Crescent, Colorado.

Light snow is falling as the Winter Park Express runs through Crescent, Colorado on its way to the ski resort.

UP 6318, one of three remaining active Southern Pacific patched AC4400CW's, leads an oil can train down from Tunnel #1 and through Coal Creek Canyon, Colorado.