UP 7185 (AC4400CW) runs through Rainbow Cut at Plainview, Colorado.

BNSF 8012 (ES44C4) muscles a freight through towards Tunnel 2 on the Moffat Tunnel Sub.

BNSF 8012 (ES44C4) shoves a freight through Plainview, Colorado as it heads towards Tunnel 2 on the Moffat Tunnel Sub.

BNSF 6377 (ES44AC) and partnering UP and Warbonnet engines meet a UP freight at Plainview, Colorado.

The California Zephyr runs through Plainview, Colorado as it begins the journey into the Colorado Rocky Mountains.

UP 7613 (ES44AC) leads for other motors and a long coal train up the 2% grade at Plainview, Colorado.

The westbound California Zephyr climbs the 2 percent grade up to Tunnel 1 at Plainview, Colorado as it heads into the Moffat Tunnel District.

The California Zephyr runs through a cut at Plainview, Colorado.

The California Zephyr escorted a F40 in the special Veterans paint scheme as it climbs up to Tunnel 1 at Plainview, Colorado.

Amtrak's Winter Park Express Ski Train provides riders with stunning views of going through 30 tunnels between Denver and the ski resort on the west side of the Continental Divide.

UP 4533 (SD70M) leads an officer's train through Plainview, Colorado.

After running through Plainview, Colorado the California Zephyr climbed up to the first of 30 tunnels that it will pass through on the Moffat Tunnel Sub.

Amtrak's Winter Park Express Ski Train exits tunnel 5 as it heads through the Moffat Tunnel District on its way to the ski resort.

The California Zephyr is about to enter the first of 29 tunnels as it runs on the Moffat Tunnel Sub in Plainview, Colorado.

After running past Blue Mountain and through Coal Creek Canyon, the California Zephyr climbs the 2% grade up to Tunnel #1 at Plainview, Colorado.