Potomac Yard is a neighborhood in Northern Virginia that straddles southeastern Arlington County and northeastern Alexandria, Virginia, located principally in the area between U.S. Route 1 and the Washington Metro Blue Line /Yellow Line tracks, or the George Washington Memorial Parkway, depending on the definition used. The area was home to what was once one of the busiest rail yards on the Eastern Seaboard of the United States. The "Potomac Yard" name is also used to refer to several developments in the area, especially the Potomac Yard Center power center and a Washington Metro station.