The Winter Park Express Ski Train begins the journey through the Rocky Mountains, passing through Eisele on the Moffat Tunnel Sub.

The California Zephyr runs through a golden sunrise at Keenesburg, Colorado as it heads towards Denver on the Brush Sub.

The California Zephyr runs through the cut in Coal Creek Canyon, Colorado.

The California Zephyr runs through downtown Keenesburg, Colorado as a bright sunrise clears the horizon.

BNSF 1746 (SD40-2) crosses the South Platte River with a Bluebonnet and a cut of freight cars that will then be sorted back in the yard.

BNSF 8403 (SD70ACe) heads towards Palmer Lake as it runs southbound on the Joint Line.

BNSF 5700 (AC4400CW) waits in the engine servicing yard for an assigned train.

BNSF 7529 (ES44DC) leads an officer's special passenger train through the trees at Monument, Colorado.

BNSF ACe 8403 leads a coal train through Spruce, Colorado

The rolling hills of Coal Creek Canyon and Plainview, Colorado provide a scenic backdrop to heritage engine 184 as it runs the California Zephyr on the Moffat Tunnel Sub.

The California Zephyr makes the S curve at Rocky, Colorado.

A late California Zephyr 6 train runs through Roggen, Colorado.

A large forest fire in Arizona has caused smoke to drift over the Colorado Front Range, providing a muted sunrise for the California Zephyr running through Keenesburg, Colorado.

After leaving Denver's Union Station, the California Zephyr turns the corner at Leyden, Colorado with only minutes to spare as the sun goes down and the shadows completely claim the tracks. Tough... (more)

A late California Zephyr provides the opportunity to get a shot at Barr Lake with the sun on the nose.