The California Zephyr runs through Coal Creek Canyon as it heads towards Tunnel #1 on the Moffat Tunnel Sub.

Sunrise catches the California Zephyr running towards Keenesburg, Colorado as it heads to Denver on the Brush Sub.

UP 4533 (SD70M) leads an officer passenger train around the windbreak at Big Ten Curve as it heads into the Colorado Rocky Mountains.

Coors Brewing Critter #997 (SW1000) makes smoke as it strains to move a cut of grain hoppers in the yard in Golden, Colorado.

BNSF 1826 (SD40-2 in old school paint) sits in the engine servicing yard in Denver, Colorado.

BNSF 8115 (ES44C4) leads a stack train through Littleton, Colorado as it heads south on the Joint Line.

BNSF 6295 (ES44AC) runs through the snow and the trees between Tolland and Rollinsville, Colorado.

Rollinsville, Colorado is getting a heavy dose of snow as BNSF 6295 (ES44AC) runs east on the Moffat Tunnel Sub.

BNSF 6295 (ES44AC) runs through the trees west of Rollinsville, Colorado on the Moffat Tunnel Sub.

Heavy snow falls as UP 6657 (AC4400CW) leads an oil train through a corner at Tolland, Colorado, heading east on the Moffat Tunnel Sub.

UP 6657 (AC4400CW) rounds the corner in heavy snow at Pinecliffe, Colorado.

Hudson Terminal Railroad's #646 (Alco S1) heads to the yard to get a cut of oil cans repositioned in the terminal at Hudson, Colorado.

Fog and heavy snow blanket the California Zephyr as it runs through the cut at Coal Creek Canyon.

A BNSF oil can gets ready to exit the Moffat Tunnel in a heavy snowstorm that dropped a foot of snow.

BNSF 6295 (ES44AC) runs through the snow towards Tolland, Colorado on the Moffat Tunnel Sub.