UP 1997 (SD40N) and other light power work the North Yard in Denver, Colorado.

UP 1667 (SD40N) takes point on the deadline in the Denver North Yard.

UP 1610 and UP 1826 both started life for the Union Pacific (1610 in 1977 and 1826 in 1972) as SD40-2's and were rebuilt to SD40N's. Of interest is the different front blade configurations.

UP 1865 (SD40N) waits for a new cut of cars to sort in the Union Pacific's North Yard.

UP 1885 leads chemung mtys westbound through Crystal Lake in golden light.

A set of trim power at UP's West Colton departure yard performs some switch moves near Pepper Ave.

It's a busy day in the Union Pacific's North Yard in Denver. Changing out track in the middle of an operating yard is challenging at best, with track maintenance vehicles jockeying for position a... (more)

UP 1610 (SD40N) works the North Yard after a night of heavy snow.

UP 1598 (SD40-2 which has been rebuilt to a SD40N) is sorting a cut of hoppers while UP 5087 brings another train into the yard. If you look closely in the background you can see a BNSF train wai... (more)

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.