UP 1624 (SD40N) struggles to pull a long cut of cars out of the UP North Yard for sorting.

UP 1842 (SD40-N) and mate get ready to sort some freight in the UP's North Yard.

Taken with permission.

A variety of engines wait for servicing in the UP's North Yard while UP 1640 (SD40N) continues to sort freight cars.

The Union Pacific Wendover Local runs every day except Sunday to service the many mineral extraction, ore loadouts and hazardous waste facilities on the shore of the Great Salt Lake and on the Bon... (more)

The remote control operator of UP 1640 (SD40N) sends a long freight south of the North Yard so that the individual cars can then be sorted.

UP 1826 (SD40N) sorts a cut of oil cans in the 36th Street Yard in Denver.

UP 1640 (SD40N) and mate work the North Yard in Denver sorting freight cars while UP 3922 (SD70M) gets ready to lead two other power units and a long freight out of the yard.

UP 1826 (SD40N) works the south end of the 36th Street Yard in Denver.

A freshly painted UP 1842 shows off the new colors in the UP's North Yard. She started life as an SD40-2 but was rebuilt with an SD40N designation.

A variety of light units work the UP North Yard in Denver, including UP 712 (GP38-2), UP 1826 (SD40N) and UP 1422 (GP40-2)

Two SD40Ns run light through CP784 towards Grant Tower in Salt Lake City. Behind it is an extra run of the MGRRO which arrived in North Yard mere minutes before from Green River, Wyoming.

Conductor of UP 1798 South inspects the running gear of the repaired tank cars in his train as they move through the switches in the yard at Chico, TX.

In the UP North Yard, I spy with my eye, a bloody nose Southern Pacific, a former SP MP15AC, a blue Smurf GATX, a former Missouri Pacific GP38-2 and a rebuilt SD40N.

The setting evening sun lights up the face of a new SD40N rebuild. The crew has taken the advantage of the snoot nose to store about a months worth of bottled water.