A Union Pacific Officer Special runs towards the evening sun as it gets ready to enter the Moffat Tunnel at Tolland, Colorado.

A Union Pacific Officer Special runs through Rocky, Colorado as it begins the journey into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

UP 8530 (SD70ACe) leads a freight down the hill from Tunnel #1 and into Coal Creek Canyon, Colorado as it heads to Denver on the Moffat Tunnel Sub.

The California Zephyr runs through Keenesburg, Colorado at sunrise.

BNSF 2749 (GP-39E) runs from Lyons, Colorado to Longmont with a short cut of hoppers.

DRGW 5771 (F9A) had a storied career in Colorado, leading the Rio Grande Zephyr until 1983, when it was then used for some time leading the Colorado Ski Train, and she even ran some freight before... (more)

DRGW 5771 (F9A) is a fan favorite at the Colorado Railroad Museum in Golden, Colorado. EMD delivered the units in 1955 with the Aspen Gold paint scheme.

The California Zephyr runs past Barr Lake in Brighton, Colorado as it heads to Denver on the Brush Sub at sunrise.

The Colorado Rocky Mountains are white with snow as BNSF 7607 (ES44DC) leads an oil train through the curve at Crescent, Colorado.

BNSF 9272 (SD70ACe) leads a long oil can train through the Big Ten Curve as it descends from Clay into Rocky, Colorado. The destination is Denver, the skyline of which is at the top of the photo.... (more)

Led by a quartet of GE C44-9Ws, Burlington Northern Santa Fe’s Denver to Stockton manifest freight climbs out of Rocky, Colorado, on April 23, 2002. In the background sits an eastbound Union Pac... (more)

Wrap Around Photo. Union Pacific Railroad 2528 (ES44AC-H/C45AH) leads a robust six-pack of power through Coal Creek Canyon approaching Blue Mountain Drive in Aravada, Colorado on July 28, 2... (more)

BNSF 9243 (SD70ACe) leaves the yard in Golden, Colorado and will head to Denver.

The Colorado Railroad Museum's Denver & Rio Grande Western Railroad's #491 (2-8-2) gets backed into the roundhouse after spinning on the turntable.

The Colorado Railroad Museum's Golden City & San Juan #4 is a 55-ton switcher painted in a Burlington Route inspired paint scheme.