The California Zephyr 5 train runs between the refineries in Commerce City, Colorado.

The California Zephyr #5 train runs through Commerce City as it heads towards Denver, Colorado.

A golden sunrise kisses the California Zephyr as it runs past Barr Lake in Brighton, Colorado.

The California Zephyr runs past Barr Lake in Brighton, Colorado as it heads to Denver on the Brush Sub at sunrise.

The California Zephyr 5 train passes Barr Lake on the Brush Sub at sunrise.

Amtrak engine #126 (P42DC) leads the California Zephyr past some apartments in lower downtown Denver as it heads towards Union Station.

Amtrakā€™s westbound California Zephyr traces the Colorado River through scenic Ruby Canyon between Shale and Utaline, Colorado, on the afternoon of June 23, 2021. The Sightseer Lounge would be a ... (more)

The clouds foreshadow a stormy afternoon as the California Zephyr passes through Keenesburg at sunrise.

A Saturday morning edition of Amtrak's eastbound Sunset Limited rounds around a small little curve just west of Casa Grande in early April.

Amtrak 355 is crossing over Woodward Avenue as they arrive at the Detroit station.

Surrounded by red sandstone cliffs lining the Colorado River, Amtrakā€™s westbound California Zephyr approaches Utaline, Colorado, in Ruby Canyon on June 23, 2021.

Amtrak engine 126 (P42DC) leads the California Zephyr around Blue Mountain as it runs through Coal Creek Canyon, Colorado.

Amtrak engine #126 (P42DC) circles around Blue Mountain as it begins the climb to Tunnel #1 on the Moffat Tunnel Sub.

The California Zephyr passes through West Barr Lake on the Brush Sub as dawn breaks in the background.

Amtrak's California Zephyr speeds westbound through Chillicothe, Iowa as it passes by BNSF empty coal train E CLOBKM0 38A, sitting on the lead to the Ottumwa Generating Station. Once Amtrak was pa... (more)