UP 6356 (AC4400CW) leads an oil can train through Blue Mountain, Colorado on the Moffat Tunnel Sub.

A friendly Conductor of UP 6356 (AC4400CW) gives a wave as the train passes through Blue Mountain as it heads west into the Colorado Rocky Mountains.

UP 6045 (AC4400CW-CTE) leads an officer special passenger train towards the crossing at Blue Mountain as it heads west on the Moffat Tunnel Sub.

UP 6045 (AC4400CW-CTE) runs towards the crossing at Blue Mountain as it heads west on the Moffat Tunnel Sub.

The back end of an oil can train just passes Blue Mountain Road as the lead motor UP 6356 (AC4400CW) gets ready to enter Tunnel #1, the first of 28 tunnels on the Moffat Tunnel Sub.

UP 6356 (AC4400CW) rounds the corner at Blue Mountain, Colorado, leading an oil can train west on the Moffat Tunnel Sub.

A Union Pacific officer's special passenger train runs around the base of Blue Mountain as it heads west on the Moffat Tunnel Sub.

The California Zephyr runs through Blue Mountain, Colorado as it heads west on the Moffat Tunnel Sub towards the Rocky Mountains and the Continental Divide.

The California Zephyr rounds the curve at Blue Mountain, Colorado as it heads into the Colorado Rockies on the Moffat Tunnel Sub.

After leaving Denver nearly 6 hours late, the California Zephyr runs past Blue Mountain on its way into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

A rare treat on the Moffat was Amtrak's newest train, the Siemens Airo Cab, seen here at Blue Mountain as it is being taken to Denver then on to Pueblo, Colorado for trials and testing. The rear u... (more)

The California Zephyr #5 train heads towards Coal Creek Canyon on the Moffat Tunnel Sub and will soon be running through 28 tunnels to get to the west side of the Continental Divide.

The California Zephyr runs a long consist through the Tollan Valley as it heads west towards the Moffat Tunnel and the Colorado Rocky Mountains.

Amtrak engine #151 (P42DC) leads the California Zephyr through the curve at Blue Mountain as it heads west on the Moffat Tunnel Sub.

Light snow catches BNSF 7073 (ES44AC) and a NS Pony moving a freight along the base of Blue Mountain as they head east on the Moffat Tunnel Sub.