Metrorail construction will cause schedule changes starting at 10 p.m. Friday, Sept. 19.
Red Line trains will run every 8 to 15 minutes, with additional trains between the Grosvenor and NoMa-Gallaudet stations during the daytime.
Silver and Yellow Line trains will operate normally, with yellow trains only running between Huntington and Mt. Vernon Sq.
Green Line trains will run every 20 minutes, and Orange and Blue Line trains will run every 24 minutes.
Normal schedules will resume Monday morning.