KCS 4709 (ES44AC) leads a grain train through the Balck Forest at Larkspur, Colorado.

BNSF 7872 (ES44DC) hits a bright sunrise as it moves through the Keenesburg Cut on the Brush Sub.

BNSF 5754 (ES44AC) leads a freight eastbound on the Brush Sub through Keenesburg, Colorado.

The California Zephyr makes the turn in Keenesburg, Colorado as sunrise casts an orange glow over the horizon.

She'll be coming around the mountain. The California Zephyr rounds the corner leaving Coal Creek Canyon and heading to Tunnel #1 at Plainview, Colorado.

Snow is falling in Coal Creek Canyon as the California Zephyr runs towards the horseshoe curve over Highway 72.

Amtrak engine #203 with the special Operation Life Saver scheme makes a brief stop at the Raton Station in New Mexico. Soon it will be running south at 78 miles per hour to the next station at La... (more)

Amtrak engine #203 (P42DC in the special Operation Life Saver scheme) splits the semaphores at Wagon Mound, New Mexico. These are some of the last operational semaphores in the country.

Amtrak engine #203 (P42DC) splits the signals at East Raton as it heads to the Station in New Mexico.

Amtrak's Operation Life Saver engine #203 (P42DC) leaves the station at Raton, New Mexico and will head south towards the Semaphore at Wagon Mound.

Shortly after leaving the platform at Trinidad, Colorado, Amtrak special Operation Lifesaver #203 (P42DC) leads the Southwest Chief through the S curves between Trinidad and Raton, New Mexico

Amtrak special Operation Lifesaver #203 (P42DC) leads the Southwest Chief through Model, Colorado on its way to Trinidad.

Snow is whipped up by the California Zephyr as it runs through Arvada, Colorado after leaving Denver's Union Station.

Light snow is falling at Pinecliffe, Colorado as the California Zephyr rounds the corner and heads towards the Moffat Tunnel.

Too close for comfort. BNSF 9124 (SD70ACe) runs past a homeless person that was walking on the tracks in Denver, Colorado.