The Norfolk Southern Railway (reporting mark NS) is a major Class I railroad 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 formed in 1982 with the creation of the Norfolk Southern Corporation, a holding company, and on December 31, 1990, the Southern Railway was renamed Norfolk Southern Railway, and control of the Norfolk and Western Railway was transfered from the holding company to the Norfolk Southern Railway. In 1999, the system grew substantially with the acquisition of over half of Conrail.