 On July 15, 1977 when both Stadium Armory & Potomac Avenue stations opened, B2 began serving both Metrorail Stations in the middle of its route.There were no major changes on its routing however.On December 28, 1991, when Anacostia station opened, B2 was extended from its original Anacostia terminus at the intersection of W Street SE & 16th Street SE, to operate to the new Anacostia station in the adjacent neighborhood of Barry Farm in Southeast Washington D.C.