A late California Zephyr #5 train leaves the Denver skyline behind (upper right) and heads west on the Moffat Tunnel Sub towards the Continental Divide in the Rocky Mountains.

Amtrak engine #22 (P42DC) leads a special train at sunset with the new Siemens Airo Cascades train towards Denver, Colorado.

Amtrak engine #146 (P42DC) leads the Winter Park Express west on the Moffat Tunnel Sub at sunrise as it carries skiers to the resort slopes just west of the Continental Divide.

Amtrak Phase VII engine #75 (P42DC) leads the Winter Park Express Ski Train west at sunrise on the Moffat Tunnel Sub towards the Colorado Rocky Mountains.

The season's first runs of the Amtrak Winter Park Express Ski Train left Denver at sunrise and took a sold-out train of skiers and snow tubers to the Winter Park ski resort on the Moffat Tunnel Su... (more)

It is sunrise on the Moffat Tunnel Sub as Union Pacific 6360 (AC4400CW) leads an oil can train through Chemical, Colorado as it heads to Denver.

Snow is falling as the California Zephyr runs through Chemical, Colorado as it heads west on the Moffat Tunnel Sub.

UP 8668 (SD70ACe) runs past wild sunflowers as it leads the Grand Junction train to Denver, Colorado.

UP 7606 (ES44AC) runs towards Arvada, Colorado as it heads to Denver on the Moffat Tunnel Sub.

UP 4533 (SD70M) leads an officer train through Barbara's Gulch between Chemical and Rocky, Colorado.

UP 1943 (SD70ACe) leads an oil can train through Chemical, Colorado as it runs up the Moffat Tunnel Sub.

A long Union Pacific oil can train runs through Chemical, Colorado, which is between Layden and Rocky. The large rocket pad gantry looking thing is part of the infrastructure used by a company ca... (more)

Sub-Zero temperatures combined with freezing fog and snow created an amazing sight along the Colorado Front Range and the Moffat Tunnel line. Here UP 7045 (C44ACM) runs past a winter scene at Che... (more)

The Rocky Mountaineer is passing through Chemical, Colorado and will soon be pulling into the station in Denver's Rhino District.

BNSF 5043 (Dash9) leads an oil can train through Chemical, Colorado on the Moffat Tunnel Sub.