Plus Corporation. Wilmington is served by the Joseph R. Biden Jr. Wilmington Rail Station, with frequent service between Boston, Massachusetts, and Washington, D.C., via Amtrak's Northeast Corridor. SEPTA Regional Rail provides frequent additional local commuter rail service to Philadelphia along the Wilmington/Newark Line. Amtrak has a major maintenance shop and yard in northeast Wilmington that maintains and rebuilds the agency's Northeast Corridor electric locomotive fleet. The Amtrak Training Facility is also located in Wilmington, as well as Amtrak's Consolidated National Operations Center (CNOC). Two freight railroads, CSX and Norfolk Southern, also serve Wilmington. Norfolk Southern serves Wilmington along trackage rights on Amtrak's Northeast Corridor, the Shellpot Secondary line heading through the eastern part of Wilmington as a bypass of the Northeast Corridor, and the New Castle Secondary line heading south to New Castle and Porter. CSX serves Wilmington along its Philadelphia Subdivision line running between Philadelphia and Baltimore. Both CSX and Norfolk Southern have a major freight-yard in the area; CSX operates the Wilsmere Yard to the west of the city in Elsmere and Norfolk Southern operates the Edgemoor Yard to the northeast of the city in Edgemoor. DART First State (Delaware Authority for Regional Transit) operates public bus service with approximately 40 bus lines serving the city and the surrounding suburbs as well as inter-county service to Dover, the state capital, and seasonal service to Lewes and Rehoboth Beach. Many DART First State bus routes operating in Wilmington serve Wilmington Transit Center and/or Rodney Square, the main bus transit hubs in the city. DART First State also offers RideShare Delaware, a program which links commuters looking for carpools or vanpools. In addition, the site offers transit riders, walkers or bikers a Guaranteed Ride Home in the event of a work emergency. Greyhound Lines operates interstate bus service out of the Wilmington Bus Station at the rail station. The closest major airport is Philadelphia International Airport. A few miles south of Wilmington is Wilmington Airport, which serves as a base for both the Delaware Army National Guard and Delaware Air National Guard. Wilmington is also served by the Port of Wilmington, a modern full-service deepwater port and marine terminal handling over 400 vessels per year with an annual import/export cargo tonnage of 5 million tons. The Port of Wilmington handles mostly international imports of fruits and vegetables, automobiles, steel, and bulk products. Utilities Delmarva Power, a subsidiary of Exelon, provides