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)

Here is a wide-angle view of the motors in the Union Pacific North Yard. On the right UP 1865 (SD40N) works sorting cars in the yard while the engines on the left either wait for service or assig... (more)

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

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

UP 1826 (SD40N) joins other motors waiting for service or assignment in the Denver North Yard.

The Union Pacific utilizes a number of rebuilt SD40-2 units (designated SD40N) in the North Yard in Denver, Colorado.

Snappy SD40N 1793 (rebuilt at Jenks Shop in NLR from an SD40-2 delivered to UP in May 1973) and a couple leased geeps are refueled.

UP 1826 (SD40N) heads into the Union Pacific North Yard to shuffle freight cars.