Among the city's major industries are shipbuilding, military, and aerospace. Newport News Shipbuilding, owned by Huntington Ingalls Industries, and the large coal piers supplied by railroad giant CSX Transportation, the modern Fortune 500 successor to the Chesapeake and Ohio Railway (C&O). Miles of the waterfront can be seen by automobiles crossing the James River Bridge and Monitor-Merrimac Memorial Bridge-Tunnel, which is a portion of the circumferential Hampton Roads Beltway, linking the city with each of the other major cities of Hampton Roads via Interstate 664 and Interstate 64. Many U.S. defensive industry suppliers are based in Newport News, and these and nearby military bases employ many residents, in addition to those working at the shipyard and in other harbor-related vocations.