BNSF 2828 (GP39-2M) runs through Longmont, Colorado and heads towards Boulder on the Front Range Sub.

UP 9080 (SD70AH) crosses over Highway 72 in Coal Creek Canyon as it leads an oil can train towards Tunnel #1 at Plainview, Colorado.

UP 9080 (SD70AH) leads a long oil can train around the corner towards Tunnel #1 at Plainview, Colorado.

Canadian Pacific 8654 (ES44AC) heads into the Denver Yard after leaving Provo, Utah the night before.

BNSF 8409 (SD70ACe) leads a KCS unit towards Tunnel #1 at Plainview, Colorado.

BNSF 2828 (GP39-2M) runs with a cut of cars towards the Longmont Depot where it will pick up orders before heading to Broomfield, Colorado.

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.