Heavy snow is falling as UP 1817 (SD40N) leads a three motor lash up as it heads to the North Yard in Denver, Colorado.

Heavy snow falls in the UP's North Yard, catching three light motors in an echelon formation as they each work a track.

Light power dominates the Union Pacific North Yard in Denver, Colorado.

UP 1817 (SD40N) heads deeper into the North Yard in Denver, Colorado to sort train cars.

UP 1817 (SD40N) gets repositioned in the North Yard in Denver, Colorado.

A snowstorm catches UP 1817 (SD40N) and mates waiting in the UP's North Yard.

Light snow is falling in the Union Pacific's North Yard as UP 1817 (SD40-2) drops off a cut of oil cans for the fuel island.

UP 1817 (SD40N) brings a train into the North Yard in Denver, Colorado.

A quartet of light power, including UP 1817 (SD40N) wait in the Union Pacific's North Yard in Denver, Colorado for their turn at sorting freight.

The Union Pacific utilized quite a few rebuilt SD40N's (former SD40-2's) to shuffle freight cars in the North Yard in Denver, Colorado.

UP 1817 (SD40N) heads into the North Yard to work sorting cars in the large Denver facility.

A number of Union Pacific SD40N (former SD40-2's) are currently working in the North Yard sorting freight cars throughout the day.

I can imagine that the remote operators for the engines in the UP's North Yard in Denver likely had HO or Lionel train sets when they were kids. Here a remote engineer pulls a string of cars out ... (more)

A stunning Colorado sunrise catches UP 1817 getting an early start in the Denver North Yard. The magic 4 to 5 minutes when the sun peaks over the horizon and shines that colorful glow on the unde... (more)

UP 1817 and UP 1881 are fairly new rebuilds of SD40-2 engines to a SD40N designation. Many of the on line rosters still have these numbers assigned to B40-8 models. These two were caught waiti... (more)