The California Zephyr rounds the corner and runs towards Tunnel #1 at Plainview, Colorado.

The California Zephyr runs through Rocky, Colorado as it gets ready to climb through 29 tunnels on its way to the Continental Divide.

BNSF 2548 (GP39-3) runs from the yard in Longmont, Colorado to the depot which is located in the downtown area.

UP 5497 (ES44AC) is joined in the Union Pacific's North Yard by other light and heavy motors.

UP 6606 (ES44AC) splits the signals in Brighton, Colorado as it heads to Denver on the Greeley Sub.

UP 9050 (SD70AH) muscles a tank car train over the bridge at Rollinsville, Colorado as it heads down to Denver on the Moffat Tunnel Sub.

Sunny skies in the Colorado Rockies find UP 9050 (SD70AH) pushing an oil can train through Rollinsville, Colorado on the Moffat Tunnel Sub.

UP 9050 (SD70AH) helps an oil can train through Pinecliffe, Colorado on the Moffat Tunnel Sub.

A BNSF freight train runs through tunnels 3 and 4 and is heading towards tunnel #2 on the Moffat Tunnel Sub at Plainview, Colorado.

Canadian Pacific engine #8734 (ES44AC) leads a loaded coal train south on the Joint Line through Nixon, Colorado.

Coors motor #998 (SW1001) runs solo through the yard towards a cut of beer cars.

Sunrise creates an orange glow over the California Zephyr as it runs through Keenesburg, Colorado on the Brush Sub.

The California Zephyr runs through Little Ten Curve as it heads to Big Ten and the Colorado Rocky Mountains.

UP 9050 (SD70AH) muscles an oil can train through Rollinsville as it heads to Denver on the Moffat Tunnel Sub.

Light snow is falling on the Brush Sub as BNSF 7735 (ES44DC) runs light with a group of motors towards Denver, Colorado.