The Orange Line of the Washington Metro consists of 26 rapid transit stations from Vienna/Fairfax-GMU to New Carrollton. It has stations in Fairfax County and Arlington, Virginia, the District of Columbia, and Prince George's County, Maryland. Half of the line's stations are shared with the Blue Line.
Orange Line needs 31 trains (Seven 8 car trains and twenty-four 6 car trains) to run at peak capacity.
Service on the Orange Line began on November 20, 1978 between National Airport and New Carrollton, with five new stations being added to the existing network from Stadium-Armory. When the line from Rosslyn to Ballston–MU was completed on December 11, 1979, Orange Line trains began following this route rather than going to National Airport station. The line was completed on June 7, 1986 when it was extended by four stations to Vienna/Fairfax-GMU.
The following stations are along the line, from west to east