Snow falls as the westbound California Zephyr rounds the curves at Glenshire.

Amtrak’s westbound California Zephyr climbs the front range of the Rockies as it leaves Rocky, Colorado, and heads toward Big 10 Curve on August 11, 2015.

The westbound California Zephyr rolls out of Truckee in the first snowstorm of the season.

The westbound California Zephyr starts its climb up the Rocky Mountains as a dense patch of fog begins to lift along the foothills.

After a long day of sightseeing at Arches Nation Park. I slipped out to catch the evening Amtrak number 5 just East of Green River.

Westbound California Zephyr flies through Western Springs.

Amtrak's California Zephyr continues its journey west along the Colorado River after departing Glenwood Springs, CO on October 3, 2015.

The California Zephyr speeds through the western Chicago suburb of Downers Grove starting its journey west from Union Station to Emeryville.

Amtrak’s westbound California Zephyr rumbles along the Colorado River, and is about to enter 463-foot Tunnel 42 just east of Radium, Colorado, on June 6, 2013.

Amtrak 182 leads the westbound Southwest Chief through Westmont.

Amtrak's "California Zephyr" snaking its way through Cold Stream Canyon as it works its way up the east slope of Donner Pass. The California Wildfires smoke is markedly present in this photo.

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.

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.

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)