The BlueLine of the WashingtonMetro consists of 27 subway stations from Franconia-Springfield to Largo Town Center.
Most of the line's stations are shared with the Orange Line, and another portion is also shared by the Yellow Line; only eight stations are exclusive to the BlueLine.
Service on the BlueLine began on July 1, 1977 on eighteen stations between National Airport in Arlington and Stadium-Armory in Washington, the first link of the Metro to Virginia.
The WashingtonMetro, or simply Metro, is the public transportation system of Washington, D.C., and neighboring suburban communities in Maryland and Virginia, both inside and outside the Capital Beltway.
However, the deepest stations in the system are not in Washington, but at the northeastern end of the Red Line, with Wheaton having the longest escalator in the western hemisphere at 230 vertical feet (70 meters) and 508 feet long (155 meters) diagonally, and Forest Glen being even deeper than that.
Metro broke ground on a light rail line in the Anacostia area on November 13, 2004.