The California Zephyr runs through Rocky, Colorado as it gets ready to climb through 29 tunnels on its way to the Continental Divide.

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

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 Little Ten Curve at Rocky Colorado and begins the journey to the Moffat Tunnel.

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.

Rio Grande EMD GP40-2 Nos. 3126 and 3121 switch the aggregates plant at the end of Rocky Spur leaving the main line at Rocky, Colorado, on February 21, 2002. During this era, two or three Rio Gran... (more)

UP 5857 (AC4400CW-CTE) leads an oil train towards a waiting BNSF train at Rocky, Colorado.

The California Zephyr runs through Big Ten Curve at Rocky, Colorado, passing a string of ballast-filled hoppers that have been welded to the adjacent rails as a wind break.

Amtrak engine #193 (P42DC) leads the California Zephyr up the grade towards Big Ten Curve at Rocky, Colorado. The track will gain enough elevation to send the train 180 degrees back on the upper t... (more)

The California Zephyr 5 train meets an idling BNSF freight at Rocky, Colorado as it begins the journey up the Moffat Tunnel Sub.

UP 6454 (AC4400CW) leads a Union Pacific passenger train through the Big Ten Curve on the Moffat Tunnel Sub

UP 6454 (AC4400CW) leads a Union Pacific passenger train special through Little Ten Curve at is heads down the Moffat Tunnel Sub towards Denver, Colorado.

With the destination of the skyline of Denver, Colorado in the upper left, UP 6454 (AC4400CW) leads an officer's special through Big Ten Curve as comes down the Moffat Tunnel Sub.

UP 6789 (AC4400CW) runs through Rocky, Colorado as it heads towards Denver.

Bringing up the rear of Amtrak’s 10-car California Zephyr is heavyweight private car Santa Fe No. 33, the “Redwood Empire,” built by Pullman in 1923 for the Santa Fe as business car No. 33. ... (more)