Curving through Tunnel 39 and into Little Gore Canyon, Amtrak No. 5, the westbound California Zephyr, is west of Azure, Colorado, along the Colorado River on August 20, 2014.

Amtrak 152 brings the California Zephyr into Denver's Union Station.

This is the platform of the temporary Amtrak station in Denver that was used while Union Station was being reworked. It was located just across the way from the Rockies ball stadium.

Entering rugged and colorful Little Gore Canyon east of Radium, Colorado, is Amtrak’s eastbound California Zephyr on August 4, 2014.

After emerging from a snowy Glenwood Canyon, the California picks up speed through Dotsero, only to be stopped shortly after this photo was taken due to a fallen boulder blocking the tracks.

Amtrak's California Zephyr wiggles its way through Glenwood Canyon, Colorado in light snow.

Salt Lake Central station is bustling with activity through the day with its numerous TRAX light-rail and FrontRunner commuter trains. Once those trains have gone away for the night, two Amtrak tr... (more)

California Zephyr trains typically round Arnold Loop during the midnight hours, so riders were treated to a daytime trip on this 12-hour late train. Also bringing up the rear is a Zephyr original,... (more)

Both westbound and eastbound California Zephyr trains typically meet on or near the Salt Flats during the midnight hour, but passengers on this 12-hour late train were treated to a daytime trip ac... (more)

Both westbound and eastbound California Zephyr trains typically meet on or near the Salt Flats during the midnight hour. This 12-hour late train departed from Salt Lake City about twenty minutes e... (more)

The westbound California Zephyrs typically traverse Soldier Summit between 7-9 PM, but this 12-hour late train gave riders a daytime view. On the tail is the Silver Solarium dome observation car.

Amtrak #5 heads west rounding the 10 degree curves at Rocky, Colorado. A wet summer has left the grass fairly green for early August. Passengers have a gorgeous day to enjoy the views....

A late-running California Zephyr drops out of Shed 10 and across Butte Canyon Bridge on the long descent of the west slope of Donner Pass. Barely visible in the distance as a thin gray line above ... (more)

California Zephyr number 6 works its way through Kyune, Utah on an early August morning.

Dawn in Spanish Fork Canyon