The all-seeing eye at Rocky, Colorado catches UP 8668 (SD70ACe) leading the Grand Junction train to Denver, Colorado at sunrise.

UP 5567 (AC4400CW-CTE) muscles a coal train uphill at Rocky, Colorado as it heads to Denver.

The Amtrak Winter Park Express Ski Train runs through Big Ten Curve to gain altitude in the effort to climb the Moffat Tunnel Sub into the Colorado Rocky Mountains.

BNSF 5700 (ES44AC) has been busting snow drifts on the Moffat Tunnel Sub as it heads to Denver, Colorado.

UP 7104 (AC4400CW) leads the Grand Junction to Denver train through Big Ten Curve as it drops in altitude and heads towards Denver, Colorado.

BNSF 5700 (ES44AC) whips up the snow as it leads the Provo train past Chemical, Colorado as it heads towards Denver.

BNSF 5700 (ES44AC) runs through Rocky, Colorado on its way to Denver on the Moffat Tunnel Sub.

UP 8654 (SD70ACe) leads an oil can train through Rocky, Colorado.

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

UP 4533 (SD70M) leads an officer passenger train around the windbreak at Big Ten Curve as it heads into the Colorado Rocky Mountains.

The westbound California Zephyr 5 train in the lower left heads toward the Big Ten Curve at Rocky, Colorado as the eastbound California Zephyr 6 train heads towards Denver's Union Station.

UP 4533 (SD70M) leads an officer special passenger train under Highway 93 and towards Rocky, Colorado.

A Union Pacific Officer Special runs through Rocky, Colorado as it begins the journey into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

BNSF 9272 (SD70ACe) leads a long oil can train through the Big Ten Curve as it descends from Clay into Rocky, Colorado. The destination is Denver, the skyline of which is at the top of the photo.... (more)

Led by a quartet of GE C44-9Ws, Burlington Northern Santa Fe’s Denver to Stockton manifest freight climbs out of Rocky, Colorado, on April 23, 2002. In the background sits an eastbound Union Pac... (more)