UP 1837 (SD40N) runs west on the Belt Line towards Denver, Colorado.

UP 1837 (SD40N) runs west towards the North Yard in Denver, Colorado.

A pair of Union Pacific SD40N's ease into Gypsum, CO with a short local from Grand Junction.

Classics of the 1980's meet as a pair of Union Pacific SD40's work on the east side of Columbus, NE and a "Minnie Winnie" Winnebago sits nearby.

UP 1687 at Provo, UT.

Two BNSF motors, including a former ATSF Bluebonnet, sit in the Union Pacific's North Yard waiting for their turn at the servicing island.

The LAW51 arrives in Smithville behind a trio of classic EMDs. The logo on the water tower makes Smithville's railroad heritage clear. Once a division point on the MKT, Smithville is quieter these... (more)

The UP LAW51 makes its weekly run from Taylor to Smithville, past the MKT depot in Elgin and the famous searchlights that still stand against all odds. After using road power for most of the p... (more)

A pair of Union Pacific SD40N light motors wait for the call to action in the North Yard in Denver, Colorado.

UP 1652 (SD40N) waits for orders in the North Yard in downtown Denver, Colorado.

UP 1826 (SD40N) rousts the birds feeding on spilled grain in the Union Pacific's North Yard in Denver, Colorado.

A blanket of snow covers the Union Pacific's North Yard in Denver, Colorado.

The remote-control engineer pulls UP 1825 (SD40N) up to the switch in the North Yard in Denver, Colorado.

UP 1826 (SD40N) takes a turn at sorting cars in the Union Pacific's North Yard in Denver, Colorado.

Sunrise shines on the bricks of the operations building at the Union Pacific's North Yard in Denver, Colorado.