Amtrak train 5, the westbound California Zephyr, passes through a short tunnel in Gore Canyon outside of Kremmling, CO on November 9, 2017.

Amtrak train 5, the westbound California Zephyr, cruises along beside the Colorado River in Glenwood Canyon as it approaches its station stop in Glenwood Springs, CO on a beautiful November 9, 201... (more)

Amtrak’s westbound California Zephyr passes through 294-foot Tunnel 39 along the Colorado River in Little Gore Canyon between Azure and Radium, Colorado, on the afternoon of August 3, 2014.

Amtrak's westbound California Zephyr rockets across the Utah desert near Green River on the former Denver & Rio Grande.

Amtrak No. 5, the westbound California Zephyr, rolls across the barren desert at the foot of the Book Cliffs in Utah. At this spot a bit of the original narrow gauge D&RG alignment can be seen bre... (more)

Amtrak 6 descends from Tunnel 1 in the evening sunlight running about 30 minutes late.

On March 5, 2012, Amtrak’s eastbound California Zephyr is eastbound through the barren desert landscape at Solitude, Utah. Apparently the locomotive recently hit some livestock on the engineerâ... (more)

Bending around a gentle curve along the meandering Colorado River is Amtrak No. 5, the westbound California Zephyr, west of Radium, Colorado, on November 7, 2012. The train has just exited Red Gor... (more)

Fog begins to lift as the California Zephyr makes a steady climb threading through the numerous tunnels of the Front Range of the Rocky Mountains after leaving Denver.

Amtrak 5 rolls along the South Boulder Creek near Tolland, CO as the train continues to climb the Rocky Mountains.

Amtrak coming through the hills of Colorado.

Early afternoon Amtrak #6, the California Zephyr, climbs the grade between Penryn, CA and Newcastle, CA on the number 2 track on a perfect winter day.

Amtrak No. 6, the eastbound California Zephyr, climbs Cedar Hill at Cedar, Utah, on the morning of May 10, 2006.

Deep in the Tunnel District between Plainview and Crescent, Colorado, Amtrak’s eastbound California Zephyr threads through Tunnel 15 on May 14, 2017.

Amtrak No. 5 heads west out of Plainview, Colorado, on the morning of May 14, 2017. The train is passing through Tunnel 3 in a series of tunnels that penetrate the unique Flatiron rock formations,... (more)