The sun has set, but tonnage still rolls east in the form of a Union Pacific stack train passing through a signal bridge at Birdwood just west of UP’s sprawling yard at North Platte, Nebraska, on ... (more)

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.

Locomotives gather on the diesel service tracks at Union Pacific’s huge yard in North Platte, Nebraska, on May 4, 2011.

The last light of day on May 4, 2011, is quickly turning to night as a freight train is classified over East Hump at Union Pacific’s sprawling yard at North Platte, Nebraska.

Union Pacific EMD SD38-2 No. Y810 sits outside waiting for the next train to sort, while East Hump Foreman R.C. McKain catches up on “paperwork” on the lower level of East Hump tower at North Plat... (more)

Several Union Pacific locomotives due for work and servicing are spotted inside the main building at the North Platte Diesel Shop on May 5, 2011. UP No. 9632 is former Southern Pacific GE C44-9W N... (more)

Four flag-barring units bring an empty corn train into North Platte for a recrew on a cool Midwest evening.

While the actual time zone 'line' between mountain and central is west of North Platte (near Paxton, NE) Union Pacific's time change is at the west end of their Bailey yard in North Platte. Having... (more)

Three EMD veterans bring the westbound local back into Bailey Yard on a cool fall evening.

Electricians work on adding PTC equipment to GE locomotives inside Union Pacific’s sprawling shop at North Platte, Nebraska, on May 4, 2011.

Union Pacific EMD SD38-2 No. Y808 sits in railroad’s huge diesel shop at North Platte, Nebraska, on May 4, 2011. The locomotive is former Chicago & North Western No. 6652, and at the time, assigne... (more)

Electricians inside Union Pacific’s North Platte Diesel Shop in Nebraska, work on wire harnesses used in PTC installation for GE AC4400CW-CTE No. 5992 on Track 1 on May 4, 2011. Amazing how much w... (more)

UP caboose's 25461 and 25815 trail a westbound freight along Hwy 30 near North Platte, NE in May of 1989.

Union Pacific GE U30C No. 2851 leads an eastbound freight east of North Platte, Nebraska, in July 1983.

The sun finally pops out from behind the clouds as two brand new Tier 4 EMD's sandwich a UP C44ACCTE departing westbound out Bailey Yard.