The Colorado Rocky Mountains loom large above UP 2698 (AC4400CW) as it leads an oil train towards Arvada, Colorado on the Moffat Tunnel Sub.

UP 6825 (ES44AC) runs past the signal at Leyden, Colorado.

UP 8009 (ES44AC) muscles an oil can through Leyden, Colorado.

UP 8639 (SD70ACe) shoves an oil can train through a very snowy Tolland, Colorado.

Over four feet of snow has fallen at Crescent, Colorado as a pair of Norfolk Southern engines shove an oil train towards Denver.

BNSF 9122 (SD70ACe) leads a coal train through the refineries in Commerce City, Colorado on its way to Denver.

BNSF 9122 (SD70ACe) leads a coal train west on the Brush Sub towards Denver, Colorado.

UP 4533 (SD70M) leads an officer train through Barbara's Gulch between Chemical and Rocky, Colorado.

UP 2698 (AC4400CW) leads an oil can train through Leyden, Colorado.

A leased GMTX #2146 (GP38-2) repositions in the yard of the refinery in Cheyenne, Wyoming.

The eastbound California Zephyr #6 train meets the westbound California Zephyr #5 train at Rocky, Colorado.

Two Phase VII P42DC's lead the California Zephyr as it runs through Coal Creek Canyon, Colorado.

Heavy frost from sub-zero temperatures cotes the trees and grass as the California Zephyr rounds the corner at Blue Mountain and heads towards Coal Creek Canyon.

Amtrak engine #157 (P42DC) leads the California Zephyr through flocked trees at Pinecliffe, Colorado.

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