The evening sun shines on the operations building in the Union Pacific's North Yard in Denver, Colorado.

UP 1957 (SD40N) sorts a cut of cars in the Union Pacific's North Yard in Denver, Colorado.

A pair of UP SD40N locomotives leads a transfer onto the Harbor from the CPKC en-route back to Proviso Yard.

With the Gateway Arch and St. Louis skyline in the distance, ALS SD40N #2044 works a hump job at Gateway Yard. Along with the two Alton & Southern SD60's, this is currently the only SD40N painted ... (more)

UP 1820 (SD40N) moves into the yard at LaSalle, Colorado.

LTS72 departs Altoona with 20 empties destined for Hi-Crush's Valley sand plant.

LTB85 returns to South St. Paul from Roseport with a quartet of SD40Ns for power. They are seen here north of Waterous while setting out the rear of their train in the Armour siding.

UP light power rolls back toward the Harbor as they past Tower B12 in Franklin Park.

UP 1865 (SD40N) sits in the Union Pacific's North Yard in Denver, Colorado waiting for orders or servicing.

With a Proviso yard crew shuttling this train east, UPs MCLPR crawls into Wheaton with a rebuilt SD40, along with various Aces & GEs, in the lead.

With time for the crew running thin, UPs Clinton, IA to Proviso, IL manifest rumbles towards Metra territory, where they'd park up for a relief. Todays train was the talk of the town with a former... (more)

On an unseasonably warm winter morning, the stars would align for UPs Clinton, IA to Proviso, IL road train to feature a former C&NW workhorse SD40 taking the charge. Seen here ducking under its r... (more)

YSPBN pulls into East Minneapolis with two SD40Ns and an SD60M for power. Once an important yard for the C&NW, East Minneapolis' footprint and role has been greatly reduced over the years. Althoug... (more)

UP 1826 (SD40N) sits on a siding in east Denver as a freight motors past and heads to the 36th Street Yard.

I think Alfred Hitchcock would have liked this photo. UP 1826 (SD40N) works the Union Pacific's North Yard in Denver, Colorado as hundreds of birds circle, waiting for the chance to land on the tr... (more)