On the service tracks at Union Pacific’s Bailey Yard locomotive facility, an employee inspects UP GE AC4400CW No. 7129 as prior to being serviced on May 4, 2011.

Union Pacific EMD SD40-2 No. 3315 and EMD SD60M No. 2313 sit outside on the west side of UP’s large locomotive shop at Bailey Yard in North Platte, Nebraska, on the afternoon of May 4, 2011.

Lots of yellow locomotives wait for the call of duty at Union Pacific's Bailey Yard.

A machinist checks the progress of the axle one wheel of a GE ES44AC that he is carefully cutting with a lathe on the wheel track inside the Diesel Shop at Union Pacific’s Bailey Yard at North P... (more)

Union Pacific EMD SD70ACe No. 1996 displays its colorful Daylight colors in its Southern Pacific heritage scheme at the locomotive facility at Bailey Yard in North Platte, Nebraska, on May 4, 2011... (more)

There really is a guy that repairs locomotive toilets
Certainly doing a thankless job, a Union Pacific employee at the Diesel Shop in North Platte, Nebraska, repairs a locomotive toilet... (more)

Locomotives really are washed once in a while
A Union Pacific EMD SD9043MAC gets a thorough cleaning before heading into the main shop for an overhaul on Track 2 at the east side buildi... (more)

Union Pacific EMD SD9043MAC No. 8046 is in for repair at the east side building at the large Diesel Shop at the railroad’s Bailey Yard in North Platte, Nebraska, on May 4, 2011.

A Union Pacific machinist works on the prime mover of UP GE C40-8W No. 9481 inside the Diesel Shop at the railroad’s Bailey Yard in North Platte, Nebraska, on May 4, 2011.

Several Union Pacific locomotives line the tracks of UP’s large North Platte Diesel Shop at Bailey Yard in North Platte, Nebraska, on May 4, 2011.

GE and EMD Locomotives pause on the diesel service tracks at Union Pacific’s Bailey Yard in North Platte, Nebraska, on May 4, 2011.

Respite at sunset: At sunset on May 4, 2011, East Hump at the sprawling Union Pacific Bailey Yard at North Platte, Nebraska, has a lull between trains. The double crossover and diamond between, ar... (more)

As freight cars roll over East Hump utilizing the north track, a track gang works on south track on May 3, 2011. Union Pacific’s massive North Platte Yard in Nebraska is always busy and has to k... (more)

A Union Pacific train gets sorted outside the windows of East Hump tower while East Hump Foreman R.C. McKain supervises the operation in the lower level of the tower at North Platte, Nebraska, on ... (more)

Jake Linderman, second trick operator on the second floor of East Hump tower, talks to a switch crew on the radio at Union Pacific’s big yard at North Platte, Nebraska, on May 3, 2011.