Rail repairs coming down the track this summer will require Metro riders to bring patience along with their farecards.

Metro is planning repairs that will force trains to share a single track on various lines and close some stations during summer weekends. Officials say summer is a good time for such undertakings, because many people in the region are on vacation or spending weekends away.

Steven Feil, Metro's chief operating officer for rail, said the track renovation program is part of a major overhaul and repair plan for the system. The system's oldest section -- on the Red Line between Farragut North and Rhode Island Avenue -- turned 29 in March. Feil said the work needs to be done to keep the subway running "the next 30 years and beyond."

The projects will continue through Labor Day, but Metro already has its eye on next fall and winter, when switch replacement projects come to the Virginia sections of the Orange and Blue lines.

The list of weekend repairs, which the transit agency said is subject to change:

June 17-19: Orange and Blue line trains will run on one track between Eastern Market and their Maryland terminals. Every other Orange and Blue train will terminate at Eastern Market and return to Virginia. Red Line trains will share a single track between Shady Grove and Grosvenor.

June 24-26: Red Line trains share a track between Silver Spring and Forest Glen.

July 8-10: Red Line trains share a track between Glenmont and Forest Glen. Orange Line trains share a track between New Carrollton and Cheverly.

July 29-31: Orange Line stations at Vienna, Dunn Loring and West Falls Church close to replace bearings on an aerial structure. A shuttle bus will run between stations.

Aug. 12-14: Orange Line stations at Vienna, Dunn Loring and West Falls Church close to continue replacing the bearings. A shuttle bus will operate between those stations.

Sept. 2-5: Red Line service will run in two sections, Shady Grove-Fort Totten and Silver Spring-Glenmont. Shuttle buses will run between Fort Totten and Silver Spring, including the Takoma station, which will be closed.

Sept. 16-18: Blue and Yellow line trains share a track between National Airport and King Street.