Metro has scheduled weekend work for three lines, but the biggest impact will be on the Orange and Blue lines in central Washington. (Susan Biddle / For The Washington Post)

The biggest weekend disruption for Metro’s rebuilding program will occur on the Orange and Blue lines through the middle of the District. Buses will replace trains between Federal Triangle and Eastern Market, and several stations will be closed. This is likely to affect travel to and from the National Mall and many of the Smithsonian museums.

The weekend schedule for the Red Line also will be affected by work zones, but all stations will be open.

After this, Metro has five more weekends of major track work in 2013. (Major track work is the kind that closes stations.) On the second weekend in November, the long Veterans Day weekend, buses will replace trains on the west end of the Red Line.

Here are this weekend’s schedules for 10 p.m. Friday through the rail system’s midnight closing Sunday.

Orange/Blue lines. Crews will be installing new signs, making tunnel repairs and working on the track bed. The Smithsonian, Federal Center SW and Capitol South stations will be closed. L’Enfant Plaza will be open for Green and Yellow Line train service only.

Free shuttle buses will replace trains between Federal Triangle and Eastern Market. On the open portions of the lines, trains are scheduled to operate every 15 minutes throughout the weekend.

Along the closed portion, the shuttle buses will follow express and local routes. The express will stop only at Federal Triangle and Eastern Market. Add 15 minutes to your normal travel time if you take the express. The local service will include stops at all the closed stations. Add eight minutes of travel time for each stop.

Red Line. Crews will be working on the track bed and third rail between Twinbrook and Grosvenor. Through the weekend, trains will leave the ends of the line at Shady Grove and Glenmont about every 16 minutes. In the middle of the line, between Grosvenor and Silver Spring, more trains will be in service between 9 a.m. and 9 p.m. Saturday and Sunday. In that zone, trains should reach platforms about every eight minutes during those hours.

Trip Planner
Metro’s online Trip Planner gets updated at midday Friday to account for the changes in the weekend schedule, including the shuttle bus services on disrupted lines. Some riders might find that a regular Metrobus route is more convenient than a train route during a disruption. To test that theory, click the “Bus” button on the Trip Planner menu and compare it with your travel time via the rail route.