A Phase VII P42DC leads the California Zephyr #5 train towards Tunnel #1 at Plainview, Colorado as it heads west on the Moffat Tunnel Sub.

The California Zephyr climbs towards Tunnel #1 at Plainview, Colorado as it heads west on the Moffat Tunnel Sub towards the Colorado Rocky Mountains.

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

Darkness falls on the Colorado Front Range as the California Zephyr #6 train rounds the corner from Tunnel #1 and drops down into Coal Creek Canyon on its way to Denver.

Amtrak engine #160 in the 'Pepsi Can' 50th anniversary paint scheme leads the California Zephyr towards Tunnel #1 at Plainview, Colorado.

Amtrak engine #160 in the 'Pepsi Can' heritage scheme leads the California Zephyr towards Tunnel #1 at Plainview, Colorado.

The California Zephyr #6 rounds the corner after coming through Tunnel #1 at Plainview, Colorado.

The Wednesday departure out of Denver is climbing up to Tunnel 1 this morning with the matched pair of GP40-3s for power. This train will become the "Canyon Spirit" starting in April of ... (more)

The California Zephyr drops down the 2% grade into Coal Creek Canyon after running through Tunnel #1 at Plainview, Colorado.

UP 7741 (ES44AC) runs through the Rainbow Cut at Plainview, Colorado as it leads a freight east on the Moffat Tunnel Sub towards Denver.

UP 7741 (ES44AC) leads the Grand Junction train through Rainbow Cut at Plainview, Colorado. Notice what appears to be a burned off shield decal on the nose.

Norfolk Southern 3641 (ET44AC) heads into Coal Creek Canyon after exiting Tunnel #1 at Plainview, Colorado.

Fog Inversion and Heavy Rain Between the deluge and fog in between 6500 and 7800 feet the trip downgrade into Denver was wet on this trip.

Amtrak engine #151 (P42DC) leads the California Zephyr #6 around the corner from Tunnel #1 as it drops down into Coal Creek Canyon, Colorado.

The California Zephyr with 3 engines, 9 passenger cars, and a baggage car exits the east portal of Tunnel #1 at Plainview, Colorado as it heads west on the Moffat Tunnel Sub.