UP 6789 (AC4400CW) leads a freight at the base of Blue Mountain on a stretch called Eisele, Colorado.

UP 6454 (AC4400CW) leads a Union Pacific passenger train special through Little Ten Curve at is heads down the Moffat Tunnel Sub towards Denver, Colorado.

Denver & Rio Grande Western #491 (2-8-2-) runs vintage freight cars around the grounds at the Colorado Railroad Museum in Golden, Colorado.

The Colorado Railroad Museum's Denver & Rio Grande Western #491 (2-8-2-) runs vintage freight cars around the grounds in Golden, Colorado.

With the destination of the skyline of Denver, Colorado in the upper left, UP 6454 (AC4400CW) leads an officer's special through Big Ten Curve as comes down the Moffat Tunnel Sub.

UP 6789 (AC4400CW) runs through Rocky, Colorado as it heads towards Denver.

Heavy snow falls at the BNSF engine service facility in Denver, Colorado as an Amtrak engine waits for the call to support the California Zephyr with added muscle. Also note the Union Pacific mot... (more)

BNSF 1812 (SD39-2) brings a load of cars into Golden, Colorado from Denver.

With the Boulder Flatirons in the background, a UP crewman walks back to his motor as BNSF 6012 (ES44AC) passes and heads up the Moffat Tunnel Sub.

UP 6789 (AC4400CW) leads a freight towards Arvada, Colorado on its way to the North Yard in Denver.

UP 6454 AC4400CW leads an officer's special down the hill into Coal Creek Canyon, Colorado as it heads to Denver.

UP 6454 AC4400CW exits Tunnel #1 at Plainview, Colorado and will drop down into Coal Creek Canyon.

UP 6789 (AC4400CW) meets a BNSF coal train at Plainview, Colorado.

UP 1826 (SD40N) pulls a cut of cars from the North Yard for sorting.

UP 6789 (AC4400CW) waits on a siding at Plainview, Colorado for a BNSF coal train which will be passing shortly.