Established in 1838, Norfolk Southern Corporation is one of the United States leading transportation companies. It maintains an intermodal network and serves several container ports in the eastern U.S. The company offers rail carrier services for metal and automotive products. Its subsidiary, Norfolk Southern Railway, operates more than 20,000 miles of track in over 20 U.S. states and the District of Columbia. Norfolk Southern Corporation serves bulk transfer facilities, power generation plants, steel and paper mills, vehicle mixing and metal processing units, and general warehouses and distribution centers. It has received ISO 9001:2000 certification and manages a staff of nearly 30,000 employees, as well as works to meet the needs of clients in the agricultural, consumer products, government, chemical, metal extraction, construction and automotive sectors. The company maintains a fleet of approximately 90,500 owned and leased freight cars and more than 3,000 locomotives. Since 2001, it has completed over 160 projects.