The California Zephyr runs through Keenesburg, Colorado at sunrise. The golden glow of the morning sun skips across the snow along the track and glints off the stainless-steel skin of the passeng... (more)

With only minutes of evening sunlight left, UP 5567 (AC4400CW-CTE) and four other UP motors head for the servicing island in the North Yard after being separated from the coal train in the upper l... (more)

The Boulder Flatirons loom big in the background as UP 8435 (SD70ACe) leads a loaded coal train through Plainview, Colorado on the Moffat Tunnel Sub.

It's Throwback Sunday at the BNSF engine servicing facility, with two former Santa Fe Warbonnets and a Cascade Green Burlington Northern SD40-2 waiting for service or orders.

A BNSF oil can train led by #6339 (ES44AC) rounds the corner after exiting Tunnel #1 at Plainview, Colorado.

Coors Critter #998 (SW1001) runs back to the Coors Brewery after delivering some grain hoppers to the silo on the east end of the grounds.

UP 5339 (ES44AC) leads freight through Crescent, Colorado on a beautiful sunny day with snow on the Rocky Mountains.

A Union Pacific loaded coal train is running through Arena (also known as Little Ten Curve) at Rocky, Colorado and will arrive in Denver within the hour.

UP 8435 (SD70ACe) leads a loaded coal train through Plainview, Colorado as it heads towards Denver.

The BNSF Denver to Provo train can be seen running through tunnels, 2, 3 and 4 north of Plainview, Colorado as it heads towards the Moffat Tunnel.

Here we can see the entire Provo to Denver train led by BNSF 6339 (ES44AC) as it runs through Big Ten Curve at Rocky, Colorado.

BNSF 6339 (ES44AC) leads the Provo to Denver train with 5 other head end units, including two Kansas City Southern engines, down the hill from Tunnel #1 and into Coal Creek Canyon, Colorado.

The California Zephyr rounds the horseshoe curve in Coal Creek Canyon and will soon enter the first of 29 tunnels before it reaches the Moffat Tunnel at Tolland, Colorado.

The California Zephyr runs through the cut at Coal Creek Canyon as it heads towards Tunnel #1.

Amtrak's Winter Park Express runs through Coal Creek Canyon, which has been frosted with ice and snow from a storm the night before.