Dynamic weather moves in over the mountains at Plainview, Colorado as UP 5624 (AC4400CW-CTE) leads a freight through Rocky on the Moffat Tunnel Sub.

Clouds hang at the mountain tops as UP 5624 (AC4400CW-CTE) runs a freight through Coal Creek Canyon on the Moffat Tunnel Sub.

UP 5624 (AC4400CW-CTE) runs a freight south through Leyden on the Moffat Tunnel Sub.

Rolling through beautiful Utah red rock country bordering Arches National Park, a 13-car Union Pacific Potash local approaches multiple curves nearing Emkay, Utah, on March 4, 2012. This is a form... (more)

UP 5992 & NS 4677 with westbound empties.

UP 5713 and crew sit tight while a higher priority eastbound freight prepares to hit the diamonds.

UP 5663 & 6405 eastbound with a grain train.

A northbound manifest passes through downtown Austin

UP 5848 & 7690 power a westbound stack train.

UP 5567 (AC4400CW-CTE) muscles a freight through Little Ten Curve at Rocky, Colorado.

Union Pacific's Heritage Donation Special makes its way across Nebraska on its way to deliver Union Pacific Steam Locomotives 3985 and 5511, along with some passenger rolling stock, to their new h... (more)

UP 5715, 6050, & KCS 4177 lead an eastbound mixed freight on main two.

A western visitor leads a tank train down The Big Sandy, through the small community of Wagner on the outskirts of Pikeville.

With only minutes of evening sunlight left, UP 5567 (AC4400CW-CTE) and four other UP motors head for the servicing island in the North Yard after being separated from the coal train in the upper l... (more)

A Union Pacific loaded coal train is running through Arena (also known as Little Ten Curve) at Rocky, Colorado and will arrive in Denver within the hour.