A nice variety of motors occupy the Union Pacific's North Yard in Denver, Colorado.

UP 1826 SD40N moves past a trio of BNSF motors sitting in the Union Pacific North Yard.

UP 1826 (SD40N) moves a cut of hoppers for sorting in the Union Pacific's North Yard in Denver, Colorado.

UP 1826 (SD40N) passes three BNSF motors that are sitting in the Union Pacific's North Yard in Denver, Colorado.

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

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

UP 1826 (SD40N) works on sorting a string of cars in the Union Pacific's North Yard in Denver, Colorado.

The Union Pacific operations building for the North Yard in Denver, Colorado gets late evening sun as UP 1826 (SD40N) moves into the yard to sort cars.

UP 1826 (SD40N) pulls a cut of cars from the North Yard for sorting.

UP 1826 SD40N get ready to sort a string of cuts in the bathroom.

UP 1826 (SD40N) moves with two other light power units through the North Yard in Denver, Colorado.

A variety of Union Pacific motors spotted in the North Yard in Denver, Colorado.

UP 1826 (SD40N) gets ready to pull a cut of cars out of the Union Pacific's North Yard for sorting.

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

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