Service was suspended on the two lines between the Archives and U Street stations because of an unauthorized person on the tracks.
Metro trains were single-tracking in part of downtown Washington during the Monday evening commute, bringing delays for riders of three lines.
Metro said trains on its Red Line were sharing a track between the Medical Center and Twinbrook stations Wednesday morning because of a disabled train.
Metro's Silver Line trains are operating only between the Wiehle-Reston East and Ballston stations.
Buses will replace trains on the stretch of the Orange Line from Stadium-Armory to New Carrollton.
Metro announced Thursday that its SafeTrack maintenance program will resume Feb. 11 with an 18-day Blue Line shutdown from Rosslyn to Pentagon.
All lanes of the Beltway’s inner loop were blocked Friday because of a crash.
Freddie Gray suffered a broken neck after his arrest. Court documents and testimony help to explain the series of events that caused his death and triggered riots in Baltimore.