The Norfolk Southern (AAR reporting marks NS) is a major Class I railroa in the United States, owned by the Norfolk Southern Corporation. The company operates 21,500 route miles in 22 eastern states, the District of Columbia and the province of Ontario, Canada. The most common commodity hauled on the railroad is coal from mines in Kentucky, Pennsylvania, Tennessee, Virginia and West Virginia. The railroad also offers an extensive intermodal network in eastern North America. The current system was planned in 1982 with the formation of the Norfolk Southern Corporation, merged on December 31, 1990 with the lease of the Norfolk and Western Railway by the Southern Railway which had been renamed Norfolk Southern. In 1998, the Norfolk Southern Railway grew substantially with the acquisition of over half of Conrail.