United States Steel Corporation (U. S. Steel) produces and sells steel mill products, including flat-rolled and tubular products, in North America and Europe. Operations in North America also include iron ore and coke production facilities, transportation services (railroad and barge operations) and real estate operations. U.S. Steel has three reportable operating segments: Flat-rolled Products (Flat-rolled), U. S. Steel Europe (USSE) and Tubular Products (Tubular). An integrated producer uses iron ore and coke as primary raw materials for steel production. U. S. Steel has annual raw steel production capability of 31.7 million net tons (tons) (24.3 million tons in North America and 7.4 million tons in Europe). On January 31, 2012, it sold U. S. Steel Serbia d.o.o. (USSS). On February 1, 2012, U. S. Steel completed the sale of the majority of the operating assets of Birmingham Southern Railroad Company, as well as the Port Birmingham Terminal.