After leaving Denver the California Zephyr runs around Blue Mountain on its way of the Moffat Tunnel Sub.

The California Zephyr rounds the corner at Pinecliffe, Colorado as it climbs higher into the Colorado Rocky Mountains.

Christmas Eve finds the California Zephyr running through the snow to get to Denver, Colorado.

Brutal temperatures of -22 degrees Fahrenheit made chasing the Zephyr a challenge, but the P42's really stood out against the white snow.

The polar vortex had temperatures in Roggen, Colorado at -22 with wind chill of -57. Freezing switches, clogged freight traffic and broken rails had the California Zephyr many hours late as it ra... (more)

Amtrak engine #189 (P42DC) leads the California Zephyr through Tonville at sunrise.

The California Zephyr runs through a very cold Wiggins, Colorado as it heads west towards Denver. The temperature was 16 degrees with 20MPH winds, making the wind chill around -1.

The California Zephyr has left Denver, Colorado and enters the cut east of Rocky as it heads towards the Rocky Mountains.

Amtrak engine 83 leads the California Zephyr through Coal Creek Canyon on the Moffat Tunnel Sub.

The California Zephyr heads into Coal Creek Canyon and is about ready to cross Blue Mountain Road, where it will stop briefly so that two Arvada policemen can deal with a problem passenger.

Sunrise catches the California Zephyr as it runs through Keenesburg, Colorado.

AMTK 155 (P42DC) crosses a bridge in Hudson, Colorado as it heads towards Denver.

The California Zephyr 5 train rounds the corner at the base of Big Ten Curve and will begin the climb up the Moffat Tunnel Sub towards the Continental Divide.

Low clouds at sunrise gives the California Zephyr a golden glow as it runs through Keenesburg, Colorado.

A frigid 9 degrees greets the morning California Zephyr 5 at Tonville, Colorado. Freezing fog has just rolled out of the area, allowing a bit of light from the golden sunrise to wash over the fro... (more)