A crew member of UP 7185 (AC4400CW) finishes the roll-by inspection of the California Zephyr and will soon continue down the Moffat Tunnel Sub towards Denver, Colorado.

Amtrak engine 152 (P42DC) rounds the corner at Plainview, Colorado as it climbs towards Tunnel 1.

BNSF 5059 (Dash9) leads another Heritage II and a Heritage I painted motor down the hill from Tunnel #1.

The snow is falling and the wind is blowing as the California Zephyr crosses the road at Plainview, Colorado.

UP 7185 (AC4400CW) leads a train through Plainview, Colorado on the Moffat Tunnel Sub.

The California Zephyr exits Tunnel 1 as it gets ready to drop into Coal Creek Canyon and then head to Union Station in downtown Denver, Colorado, the skyline of which is visible in the distance. ... (more)

UP 7682 (ES44AC) muscles a coal train through tunnels 3 and 4 on the Moffat Tunnel Sub.

UP 7185 (AC4400CW) leads a 90-car oil can train down the Moffat Tunnel Sub at Plainview, Colorado.

A crew member of a Union Pacific oil can train performs a run-by inspection of the California Zephyr as it passes at Plainview, Colorado.

UP 7185 (AC4400CW) leads an oil can train through Rainbow Cut at Plainview, Colorado.

Amtrak engine 168 (P42DC) leads the California Zephyr up the grade towards tunnel 3 as it heads into the Colorado Rocky Mountains.

The California Zephyr leaves Denver behind as it makes the turn at Leyden, Colorado and heads towards the foothills and the tunnel district of the Moffat Line.

The California Zephyr emerges from Tunnel 4 as it heads up towards 25 more tunnels, including the 6-mile-long Moffat Tunnel that runs under the Continental Divide.

The California Zephyr rounds the horseshoe curve in Coal Creek Canyon and climbs to Tunnel 1 at Plainview, Colorado.

The California Zephyr runs between tunnels 3 and 4 on the Moffat Tunnel Sub.