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)

UP 7853 (AC45CCTE) sits in Denver waiting for a new crew that will take the oil can train up the Moffat Tunnel Sub and across the Continental Divide.

UP 1826 (SD40N) works the ladder in the North Yard in Denver, Colorado.

There is always a nice variety of light power in the Union Pacific's North Yard. Among the group on this day was UPY 618, an ex-Missouri Pacific GP15-1 that was built in September of 1979.

Storm clouds bringing light snow to the high country biol up near Tolland, Colorado as UP 6968 (AC4400CW) runs through the valley towards the Moffat Tunnel.

The crew of Loram maintenance of way train 417 get ready to leave the BNSF engine servicing facility in Denver, Colorado.

UP 6968 AC4400CW has recently gone through the refurbishing program and sports the new UP paint scheme.

UP 2751 (C45AH) runs through Tolland, Colorado at the height of the changing of the aspen, which have turned the valley into gold.

UP 695 (GP38N) waits for the call of duty to shuffle cars in the Union Pacific's North Yard in Denver, Colorado.

Rocky Mountain Rail Tours #2021 (GP40-3) leads the passenger train out of Tunnel #1 at Plainview, Colorado and will drop into Coal Creek Canyon on its way to Denver.

UP 6968 (AC4400CW) in a new coat of paint leads a rail train through the Tolland Valley in Colorado. It will run through the 6.2-mile-long Moffat Tunnel before stopping in Bond, Colorado.

A freshly painted UP 6968 (AC4400CW) leads a rail train through Rollinsville, Colorado as it heads towards the Moffat Tunnel.

UP 1826 (SD40N) works on sorting a string of cars in the Union Pacific's North Yard in Denver, Colorado.

Storm clouds are brewing as BNSF 5693 (Dash9) leads a freight towards Rollinsville, Colorado as it drops down the mountain after exiting the Moffat Tunnel's East Portal.