Metro riders can expect long waits for trains this weekend yet again as Metro continues its track repairs. Crews are rebuilding the system bit by bit after years of neglect.

Also, Metro will open early on Sunday, at 5 a.m., for the Nike Women Half Marathon.

Riders can expect the following delays starting 10 p.m. Friday:

• On the Red Line, three stations will be closed — Rhode Island Ave., Brookland and Fort Totten. Shuttle buses will replace trains between NoMa-Gallaudet and Takoma. At Fort Totten, the Yellow and Green lines will still operate. In other sections of the Red Line, trains will come every 10 minutes during daytime.

• On the Blue and Orange lines, trains will share a single track between McPherson Square and Smithsonian stations. Trains will arrive about every 20 minutes.

• On the Green Line, trains will single track between Greenbelt and College Park, as well as between Naylor Road and Branch Avenue. Trains will arrive about every 20 minutes.

• On the Yellow Line, trains will operate between Fort Totten and Huntington and will arrive about every 20 minutes. The long waits are a result of work on other lines that intersect the Yellow Line, Metro officials said.