Metro riders should expect slow-going on the Red and Orange lines this weekend as crews repair tracks.
Yellow, Blue and Green line riders are off the hook this weekend, March 15-17.
The trackwork is part of Metro's ongoing effort to catch up on maintenance after the 2009 Red Line crash that killed nine people.
Metro also will open two hours early -- at 5 a.m. -- on Saturday to help runners get to the SunTrust Rock 'n' Roll Marathon and the CareFirst BlueCross BlueShield Rock 'n' Roll Half Marathon, which will start near the Washington Monument. The extra service is being paid for by the races' sponsors.
Riders can expect delays on the following lines this weekend:
• On the Red Line, three stations -- Rhode Island Ave, Brookland and Fort Totten - will be closed. Riders will have to take free shuttle buses instead of trains between NoMa-Gallaudet and Takoma. Riders taking the shuttles should expect to add about 40 minutes to their travel times, or use the Green Line between Gallery Place and Fort Totten to avoid the trackwork area. Trains on the rest of the Red Line will run every 10 minutes between 9 a.m. and 9 p.m. and every 15 minutes before and after that, Metro said.
• On the Orange Line, trains will single-track in two areas: between East Falls Church and West Falls Church, and between Stadium-Armory and Cheverly. Trains will arrive about every 24 minutes, Metro said.