Repair work will close four Metrorail stations this weekend and affect riders on four of the system’s five rail lines.

The work is scheduled to begin at 10 p.m. Friday and last until the system closes Sunday night.

On the Red Line, the Rhode Island Ave-Brentwood, Brookland-CUA and Fort Totten stations will be closed to allow for platform reconstruction and other work. Buses will replace trains between NoMa-Gallaudet U and Takoma.

The Ronald Reagan Washington National Airport station, on the Blue and Yellow lines, will also be closed. Shuttle buses will run between the Crystal City and Braddock Road stops; some buses will stop at all three stations, while others will bypass the airport.

In addition, trains will single-track on two segments of the Orange Line: Trains will share a track between the East Falls Church and West Falls Church stations because of Silver Line testing and between Stadium-Armory and Cheverly for platform reconstruction and track work.

Next weekend, buses will replace trains between Stadium-Armory and Cheverly on the Orange Line, and between Stadium-Armory and Benning Road on the Blue Line.