The MBTA will close Red Line stations north of Harvard Square this Saturday and Sunday and replace train service with buses.
Train service will resume Monday at the Porter Square, Davis Square and Alewife stations, but buses will also replace the trains at three three stations during the last weekend of November and the first two weekends of December, according to the MBTA.
The work is an extension of construction that began last fall along the same stretch of track forcing closures of the stations and shuttle bus service on weekends for four months.
The portion of the Red Line track opened in 1985, and uses concrete slabs resting on absorbent rubber disks to cushion noise and vibration for above-ground neighbors.
Workers will also be replacing track and the power rail and will address leaks in the tunnel to prevent further deterioration.
The work this fall is part of a $34 million project being funded through the MBTA’s capital improvement plan and crews will be removing and replacing corroded concrete slabs along the track, according to the MBTA.
The Porter, Davis and Alewife stations have about 21,000 passenger boardings on a typical Saturday, and about 14,000 boardings on Sundays.
The stations have to be closed on weekends because the work can not be completed during the short overnight periods in which the Red Line is not operating, according to the MBTA.