UP 8006 (ES44AC) leads a power heavy train south on the Greeley Sub through Platteville, Colorado.

UP 8006 (ES44AC) leads a power-heavy freight south on the Greeley Sub through Brighton, Colorado. Warm weather has melted the recent snow, providing a reflecting mud puddle alongside the track.

Climbing up to Donner Pass, westbound Union Pacific ES44AC no. 8006, leads stacks around Glenshire on the Roseville Subdivision.

Operator Jeff Lubash monitors information on the computers in the Diesel Tower above the locomotive servicing area at Union Pacific’s North Platte, Nebraska, yard on May 4, 2011.

Westbound train east of The Dalles in the Columbia River Gorge.

Westbound train west of Biggs in the Columbia River Gorge.

Heatwaves rise off the radiators of the diesels on a southbound Union Pacific manifest is about to begin the hard work of crossing southern California's Tehachapi Mountains as it approaches the fi... (more)

The crew of this Union Pacific manifest knocks down the signal at Rodell on the Altoona Sub just a few miles east of Fall Creek, Wisconsin.

A southbound Union Pacific manifest is about to begin the hard work of crossing southern California's Tehachapi Mountains as it enters the first curve since departing Bakersfield 15 miles earlier.... (more)

UP train ZG4CI 13 led by a fairly new ES44AC heads into the rapidly setting sun as the train glides past Kansas City Union Station, and a set of searchlight signals whose days are numbered with re... (more)

The setting sun paints the sky orange as the day comes to an end. A green signal stands above the weeds silhouetted off the sky, giving a Union Pacific manifest clear track east to Adams, Wisconsi... (more)

UP 8006 leads an empty windmill train northbound on the Palmdale Cutoff between Phelan and Wash on the Mojave Sub.

UP8006 (SD9043MAC) pulls its manifest train over the Chicago Sanitary and Ship Canal as it approaches the CN and Ash St Crossing. This set of four bridges once had four sets of double track, 8 tr... (more)