BNSF 6295 (ES44AC) leads a freight down the mountain between Tolland and Rollinsville, Colorado.

The California Zephyr 5 train through Coal Creek Canyon during snow and heavy fog.

Amtrak engine #157 (P42DC) leads the California Zephyr 5 train through Coal Creek Canyon after a snowstorm coated the valley with a few inches.

A Union Pacifc oil can train passes a BNSF freight at Rocky, Colorado on the Moffat Tunnel Sub.

BNSF 5756 (ES44AC) muscles a freight through a frosty east Rollinsville, Colorado on the Moffat Tunnel Sub. Heavy fog and snow has covered the valley and nearby mountains.

Heavy snow is falling at Tolland, Colorado, obscuring the east portal of the Moffat Tunnel from which UP 6864 (ES44AC) has just emerged.

A large herd of elk greets BNSF 6295 (ES44AC) as it runs a freight through a foggy and snowy Rollinsville, Colorado on the Moffat Tunnel Sub.

BNSF 6295 (ES44AC) leads the Provo to Denver train out of the east portal of the Moffat Tunnel and into light snow falling over Tolland, Colorado.

Snow and flocked the trees and fog shrouds Coal Creek Canyon as the California Zephyr runs through the cut leading to the climb towards Tunnel #1.

At the Nixon Power Plant. SP 6785 6840 7424 8361 unload a coal train, at a Colorado power plant. The picture really depicts how the Southern Pacific looked the last few years.

AMTK 198 (P42DC) skirts the base of Blue Mountain as it heads into Coal Creek Canyon on the Moffat Tunnel Sub.

UP 7801 (ES44AC) leads a train through Little Ten Curve at Rocky, Colorado.

UP 1507 (GP40M) passes the Union Pacific's operations building at the North Yard in Denver, Colorado.

Amtrak’s 50th anniversary locomotive painted in Heritage I colors, GE P42DC, No. 161, leads the eastbound California Zephyr into the horseshoe curve at Coal Creek Canyon between Plainview and Ei... (more)

UP 9581 runs into light snow showers as it exits the east portal of the Moffat Tunnel with an oil can train.