Under turbulent skies. GP38's 724 and 665 pull there train out of the Chevron refinery.

UP 1980 (GP38N) and other light power sit in the North Yard in Denver, Colorado.

UP 1980 (GP38N) joins other light power in the North Yard as they wait for their chance to sort freight cars.

UP 700 (GP38N) works the North Yard in Denver, Colorado during a heavy snow storm.

UP 1980 (GP38N) waits in the Union Pacific's North Yard in Denver, Colorado for service at the fuel islands.

UP 695 (GP38N) waits for the call of duty to shuffle cars in the Union Pacific's North Yard in Denver, Colorado.

I was happy to find a GP38N I hadn't photographed yet. Union Pacific 693, originally Missouri Pacific 2193, is coupled to UP 633. A very good looking set of units together.

UP 688 (GP38N) moves into the North Yard in Denver, Colorado to sort rolling stock.

UP 1980 (GP38N) heads into the North Yard for a day of sorting cars in the snow.

UP 688 (GP38N) runs in the Union Pacific's North Yard in Denver, Colorado.

Union Pacific GP38's 578 and 724 make their way back to Roper yard, with a pretty substantial train of tanks.

What a good looking set of locomotives. A couple of nicely painted GP38's UP 578, and UP 724.

The sound of these two GP38's moving all these tank cars was wonderful to hear. UP 578 of Southern Pacific Heritage, and 724 of Missouri Pacific heritage work the Chevron refinery.

UP 1980 (GP38N) sits on the ready track next to the fueling island in the Union Pacific's North Yard in Denver, Colorado.

UP 1980 (GP38N) sits in the North Yard with other light motors after a fresh layer of snow fell the day before.