Snow blankets the tracks of the Moffat Tunnel Sub as the California Zephyr drops down from Tunnel #1 at Plainview, Colorado.

Freezing temps and blowing snow greet the California Zephyr as it exits the east portal of the Moffat Tunnel.

The California Zephyr has left the blowing snow in the Colorado Rocky Mountains and heads towards Denver as the sunset transitions to the blue hour.

Heavy snow and strong winds greet the California Zephyr as it exits the east portal of the Moffat Tunnel.

Amtrak engine 15 (P42DC) leads the California Zephyr through the trees at Tolland, Colorado.

The California Zephyr #5 train runs through Tolland, Colorado as it heads towards the Moffat Tunnel and the Continental Divide.

Dawn is breaking on the horizon at the California Zephyr #5 train runs past Barr Lake in Brighton, Colorado.

AMTK 15 hustles the eastbound California Zephyr along the Colorado River and through Ruby Canyon.

The California Zephyr runs past the BNSF intermodal facility in Denver, Colorado.

Amtrak engine #15 (P42DC) leads the California Zephyr through Keenesburg, Colorado as a pastel sunrise greets the crew and passengers.

The California Zephyr runs through Keenesburg as the sunrise casts an orange glow on the stainless-steel cars and silver engines.

The clouds have parted just as the California Zephyr runs through Tunnel 13 in South Draw, Colorado.

Amtrak engine #15 (P42DC) leads the California Zephyr through the trees in South Draw, Colorado on the Moffat Tunnel Sub.

The Southwest Chief leans into the high-speed curve west of Model, Colorado.

The Southwest Chief crew gives a wave as they take the high-speed elevated curve at Model, Colorado on their way to Trinidad.