The Norfolk Southern Railway (reporting mark NS ) is a Class I freight railroad in the United States. With headquarters in Norfolk, Virginia, the company operates 19,420 miles (31,250 km) route miles in 22 eastern states, the District of Columbia, and has rights in Canada over the Albany to Montréal route of the Canadian Pacific Railway, and previously on CN from Buffalo to St. Thomas. NS is responsible for maintaining 28,400 miles (45,700 km), with the remainder being operated under trackage rights from other parties responsible for maintenance. The most common commodity hauled on the railway is coal from mines in Indiana, Kentucky, Pennsylvania, Tennessee, Virginia, and West Virginia. The railway also offers the largest intermodal network in eastern North America.