Light fog and ridge-hugging clouds cover Coal Creek Canyon as the California Zephyr heads west on the Moffat Tunnel Sub.

Stormy weather is moving over Coal Creek Canyon as the California Zephyr heads into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

Storm clouds are moving down the mountain as the California Zephyr rounds the horseshoe curve in Coal Creek Canyon, Colorado.

The California Zephyr runs towards Denver's Union Station, passing through the Union Pacific's North Yard.

The California Zephyr drops into Rocky, Colorado while running west on the Moffat Tunnel Sub.

Amtrak engine #54 leads the California Zephyr through the North Yard as it heads towards Denver's Union Station.

The California Zephyr gets ready to enter Little Ten Curve as it begins the climb on the Moffat Tunnel Sub.

A rare morning thunderstorm, currently over the City of Boulder, creates some amazing contrast in the sky as partly cloudy skies dominate to the east over the plains. Under the unusual skies, we f... (more)

The California Zephyr runs through Rollinsville, Colorado as it climbs higher on the Moffat Tunnel Sub.

A rare sight finds the California Zephyr leaving the Cheyenne, Wyoming depot. Flooding in Nebraska damaged sections of track, necessitating the diversion through the northern part of Nebraska and... (more)

The California Zephyr passes through Carr, Colorado as it runs on the Greeley Sub towards Denver.

The California Zephyr runs through Rollinsville, Colorado as a massive thunderhead blooms in the background along the Front Range.

The California Zephyr heads downhill into the sun at Rocky, Colorado as it gets ready to enter Little Ten Curve while running on the Moffat Tunnel Sub.

The California Zephyr runs through the signals at Carr, Colorado on the Greeley Sub after leaving Cheyenne, Wyoming. The rare diversion was to avoid damaged track from floods in Nebraska.

The California Zephyr runs past a reflecting puddle in Brighton, Colorado as it runs between Cheyenne, Wyoming and Denver due to flooding in Nebraska.