EntityQ171221· pop 47· linked from 1,169 articlesWashington MetroSign in to saveWashington, D.C. rapid transit systemGallery (12)Connectionsstandard-gauge railwayEntityLoudoun CountyEntityCategories1976 establishments in Washington, D.C.750 V DC railway electrificationBrutalist architecture in the United StatesHarry Weese buildingsPassenger rail transportation in MarylandPassenger rail transportation in VirginiaPassenger rail transportation in Washington, D.C.Rapid transit in MarylandRapid transit in VirginiaRapid transit in Washington, D.C.Train-related introductions in 1976