|Marathon Petroleum Corporation (Marathon Petroleum) is engaged in refining, transporting and marketing petroleum products in the United States. The Company's refining, marketing and transportation operations are concentrated in the Midwest, Gulf Coast and Southeast regions of the United States. These include a six-plant refining network, a terminal and transportation system, and wholesale and retail marketing operations. This includes both the Marathon Brand and Marathon Petroleum's wholly owned retail marketing subsidiary, Speedway LLC and operated retail gasoline and convenience stores. As of December 31, 2012, the Company leased or owned approximately 1,944 leased and 27 owned railcars of various sizes and capacities for movement and storage of refined products.