Two Class I railroads, Norfolk Southern and CSX, provide freight rail service in northern New Castle County. Norfolk Southern provides freight service along the Northeast Corridor and to industrial areas in Edgemoor, New Castle, and Delaware City. CSX's Philadelphia Subdivision passes through northern New Castle County parallel to the Amtrak Northeast Corridor. Multiple short-line railroads provide freight service in Delaware. The Delmarva Central Railroad operates the most trackage of the short-line railroads, running from an interchange with Norfolk Southern in Porter south through Dover, Harrington, and Seaford to Delmar, with another line running from Harrington to Frankford and branches from Ellendale to Milton and from Georgetown to Gravel Hill. The Delmarva Central Railroad connects with the Maryland and Delaware Railroad, which serves local customers in Sussex County. CSX connects with the freight/heritage operation, the Wilmington and Western Railroad, based in Wilmington and the East Penn Railroad, which operates a line from Wilmington to Coatesville, Pennsylvania.