UP 1640 (SD40N) works a cut of cars in the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) works shuffling cars in the North Yard in Denver, Colorado.

UP 1865 (SD40N) waits in the North Yard for its turn to shuffle freight cars.

UP 1826 (SD40N) has yard sorting duty as it heads into the North Yard for another cut of cars.

The fresh snow really makes the Armour Yellow of UP 1997 and the other motors in the North Yard pop.

UP 1826 (SD40N) works the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) works the North Yard in Denver, Colorado as other engines are getting service.

UP 1865 (SD40N) leads a freight over the South Platte River in northeast Denver, Colorado.

UP 1826 (SD40N) shoves a cut of cars back into the North Yard in Denver, Colorado.

UP 1826 (SD40N) works a cut of cars in the North Yard in Denver, Colorado.

UP 1826 (SD40N) works the North Yard in Denver, Colorado. SD40N's seem to be the preferred motor for shuffling the cars.

UP 1997 (SD40N) runs into the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) shuffles a cut of oil cans in the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) moves a cut of cars in the North Yard in Denver, Colorado.

There is usually a lot to see in the Union Pacific's North Yard in Denver, Colorado. Light power will be shuffling cars in the yard and heavy power can usually be spotted coming and going at the ... (more)