Missouri Pacific Heritage UP 1982 (SD70ACe) enters the cut after running through Rocky, Colorado on its way to Denver.

UP 8850 (SD70AH) leads a long freight around Big Ten Curve as it drops in elevation on the Moffat Tunnel Sub at Rocky, Colorado.

Amtrak engine 71 (P42DC) runs through Big Ten Curve as it heads towards the Moffat Tunnel district and the Colorado Rocky Mountains.

Fog and light snow envelope the California Zephyr as it runs through Rocky Colorado on its way to the Moffat Tunnel.

The California Zephyr meets a BNSF freight at the Rocky Siding before heading into Little Ten and Big Ten curves.

Amtrak engine 142 (P42DC) rounds the Big Ten Curve as it climbs the 2% grade towards Eisele, Colorado.

The California Zephyr meets a BNSF Coal train at Rocky, Colorado as it runs west on the Moffat Tunnel Sub.

A Union Pacific coal empty works westbound through Big 10 Curve between Rocky and Clay, Colorado, on the stormy afternoon of June 2, 2007. Led by a pair of GE AC4400CW locomotives, lone GE AC4400C... (more)

UP 8435 (SD70ACe) leads a loaded coal train through the cut at Rocky, Colorado and will run under Highway 93 as it heads towards Denver, Colorado.

The California Zephyr meets a Union Pacific coal train at the Rocky Siding as it heads towards the Colorado Rocky Mountains.

The California Zephyr climbs out of the Big Ten Curve cut as it works its way up the Moffat Tunnel Sub towards the Colorado Rocky Mountains.

UP 5105 (SD70M) leads the Rocky Mountaineer passenger train on a test run from Denver, Colorado to Moab, Utah and back. The train will begin passenger service on August 11 and the vista dome type... (more)

UP 5105 (SD70M) leads the Rocky Mountaineer passenger train through Little Ten Curve at Rocky, Colorado.

There is a new passenger train set to run on the Moffat Line between Denver, Colorado and Moab, Utah. The train will offer excursions that will include a stop at Glenwood Springs. Most of the c... (more)

BNSF 7068 (ES44C4) leads a long freight through the winding turns of Big Ten Curve as it heads towards Denver, Colorado.