Amtrak's Winter Park Express Ski Train exits Tunnel 1 on a frosty morning as it runs passengers up the Moffat Tunnel Sub to the ski resort at the top of the Rocky Mountains.

Heavy snow is falling at the east portal of the Moffat Tunnel as UP 8051 (ES44AC) splits the signals while running east on the Moffat Tunnel Sub towards Tolland, Colorado.

With the back of the oil can train still coming through Tunnel #1 in the background, UP 8995 (SD70AH) heads towards Blue Mountain Road in Coal Creek Canyon.

On Time California Zephyr rolls west through Crescent.

BIG TEN Amtrak 6 the California Zephyr descends the Rocky Mountains through Big Ten, Little Ten in Arena, and then Rocky and beyond to Leyden in this 753-second = 12.55 minute exposure... (more)

Big 10 curve surrounded by the foothills and Rocky Mountains in the distance shows the great climb the California Zephyr has ahead.

Snow is falling in Coal Creek Canyon as the California Zephyr runs towards the horseshoe curve over Highway 72.

UP 9080 (SD70AH) has just run through Coal Creek Canyon and leads a freight up the grade towards Tunnel #1 at Plainview, Colorado.

The California Zephyr runs through Little Ten Curve as it heads to Big Ten and the Colorado Rocky Mountains.

UP 9003 (SD70AH) leads a long oil can train down the valley into Tolland, Colorado after exiting the Moffat Tunnel east portal.

BNSF 6004 (ES44AC) leads the BNSF Provo train through tunnels 4, 3 and 2 as it heads to Denver, Colorado on the Moffat Tunnel Sub.

With the majestic Boulder, Colorado Flatirons in the background, the California Zephyr runs through Little Ten Curve at Rocky as it begins the journey up the Moffat Tunnel Sub.

The California Zephyr runs through Tunnel #3 on the Moffat Tunnel Sub as it begins the climb into the Colorado Rocky Mountains.

Amtrak engine #134 (P42DC) leads the California Zephyr around Big Ten Curve as it runs past a line of ballast-filled coal cars that have been welded to an adjacent track as a wind break.

Rocky Mountaineer’s “Rockies to the Red Rocks” tour train has just exited Tunnel 1 east of Plainview while climbing Colorado’s front range mountains westbound on the morning of September 1... (more)