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)

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

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

The California Zephyr 5 train has left Denver and is running towards Rocky, Colorado on the Moffat Tunnel Sub.

Dynamic weather moves in over the mountains at Plainview, Colorado as UP 5624 (AC4400CW-CTE) leads a freight through Rocky on the Moffat Tunnel Sub.