Amtrak train hauled by P42DC locomotives 137 and 11.

The California Zephyr 5 train passes by Barr Lake at sunrise as it heads to Denver, Colorado on the Brush Sub.

Fog wafts off Barr Lake as the California Zephyr runs through at sunrise on the Moffat Tunnel Sub.

The California Zephyr runs through Plainview, Colorado as it heads into the Rocky Mountains on the Moffat Tunnel Sub.

Amtrak engine #137 (P42DC) leads the California Zephyr 5 train through Rollinsville, Colorado on the Moffat Tunnel Sub.

Amtrak engine #137 (P42DC) pulls the California Zephyr into the station at Glenwood Springs, Colorado, where it will pick up passengers for the next leg to Denver.

Amtrak engine #76 (P42DC) runs the California Zephyr through the S curve leading to Plainview, Colorado.

The California Zephyr runs through Coal Creek Canyon, Colorado as it heads towards the Rocky Mountains.

A pair of P42s lead the Silver Star into Raleigh.

The California Zephyr #5 train gets ready to cross Highway 72 in Coal Creek Canyon, Colorado.

The California Zephyr 5 train runs underneath the bridge at the Glenwood Springs Depot.

The California Zephyr leaves the Glenwood Springs Depot and will run west towards the next station at Grand Junction, Colorado.

The California Zephyr rounds the horseshoe curve in Coal Creek Canyon and will soon enter the first of 29 tunnels before it reaches the Moffat Tunnel at Tolland, Colorado.

The California Zephyr runs through the cut at Coal Creek Canyon as it heads towards Tunnel #1.

Amtrak 14, the northbound Coast Starlight, is just an hour into its 1,377 mile journey to Seattle as it slices its way through the rock formations in Chatsworth, Calif., as it prepares to d... (more)