BNSF 6123 (ES44AC) leads the Provo train through Tolland, Colorado on the Moffat Tunnel Sub.

BNSF 2371 (GP38-2) in a Heritage II paint scheme with the wagon wheel on the nose, works the yard in downtown Denver, Colorado.

UP Big Boy #4014 (4-8-8-4) crosses a bridge west of Hugo, Colorado as the locomotive heads to Denver on the old Kansas-Pacific rail line.

A group of Union Pacific heavies get ready to lash up to a long oil can train which will soon get the green to head west on the Moffat Tunnel Sub.

Greeley, Colorado has that 'land that time forgot' vibe as telegraph poles and old grain businesses line the tracks that go through town. UP 1820 (SD40N) heads into town and will continue through... (more)

UP 1640 (SD40N) and mate have the yard to themselves as they work on sorting freight cars into the ladders of the North Yard in Denver, Colorado.

UP 1357 (former Denver & Rio Grande Western GP40-2) waits in the yard for orders to shuffle freight cars.

Union Pacific's Big Boy #4014 backs under the signal bridge in Cheyenne, Wyoming as it finishes its second trip of the year.

Union Pacific's Big Boy #4014 (4-8-8-4) runs over a bridge spanning a wide arroyo in Peoria, Colorado.

It is sunrise on the Moffat Tunnel Sub as Union Pacific 6360 (AC4400CW) leads an oil can train through Chemical, Colorado as it heads to Denver.

The Colorado Railroad Museum frequently uses their Rior Grande Southern Galloping Goose #7 to give passengers rides around the grounds in Golden, Colorado.

Amtrak #180 (P42DC) rounds the corner as it leads the California Zephyr towards Tolland, Colorado on the Moffat Tunnel Sub.

BNSF 1720 (SD40-2) and yard mate have just received a new load of fuel and sand at the BNSF engine facility in downtown Denver, Colorado.

BNSF 1660 (SD40-2) is one of 5 Bulington Northern Cascade Green units working the yard in Denver, Colorado.

BNSF 9083 (SD70ACe) runs through Rocky, Colorado as it heads to Denver on the Moffat Tunnel Sub.