Rail King RK 320 No. 96 switches a freshly-painted C&NW covered hopper at Union Pacific’s De Soto car shops at De Soto, Missouri, on September 29, 2011. This Cummins-powered mobile railcar mover (also known as a trackmobile) weighs in at 49,000 pounds, and has 32,400 lb tractive effort with one coupler used (48,600 lb when both couplers are used, due to extra weight).