Many riders have seen these new railcars rolling through various lines. This is to work out bugs before mass production. The test track between Greenbelt and College Park will allow for final tests before each new 7000 series car is accepted into the fleet. (Robert Thomson/The Washington Post)

Metro’s rebuilding program leaves all stations open this weekend, but track work affects schedules on three lines.

Red Line. Crews will work on the tracks between Shady Grove and Twinbrook and on track-side equipment between Judiciary Square and Rhode Island Avenue. Trains are scheduled to leave the ends of the line at Shady Grove and Glenmont every 15 minutes throughout the weekend. Between Grosvenor and NoMa-Gallaudet, more trains will be in service from 9 a.m. to 9 p.m. Saturday and Sunday. In that zone, trains should reach platforms about every 10 minutes.

Orange Line. Crews will work on rail fasteners between Foggy Bottom and Clarendon. All along the line, trains are scheduled to operate every 20 minutes throughout the weekend.

Blue Line. Between Foggy Bottom and Arlington Cemetery, crews will work on the rail fasteners. Between Addison Road and Morgan Boulevard, they will be doing preliminary work on a switch replacement project. All along the line, trains are scheduled to operate every 20 minutes through the weekend.

Green Line. Trains will operate on their normal schedules throughout the weekend. But at College Park, they all will arrive on the Greenbelt side of the platform. Crews are working on a test track for new railcars between College Park and Greenbelt.