Metro service was suspended between the Smithsonian and Federal Center SW stations Friday morning after someone was struck by a train at L'Enfant Plaza.
Police were called to the station about 9:15 a.m.
Metro said a male was struck by a Blue Line train after an intentional act.
Metro announced later that trains were not running on parts of the Blue, Orange and Silver lines.
Riders were urged to take alternate routes, including walking to different stations or taking buses and shuttles. Shuttle buses arrived at L'Enfant about 40 minutes after the shutdown.
Trains began single-tracking between Smithsonian and Federal Center SW stations Service returned to normal by noon.
Metro urged people to consider alternate routes, which they detailed on the Metrorail Info Twitter page.
An earlier version of this article based the timing of the service suspension on mislabeled time stamps. It has been corrected.