On May 24, 2020, service was cut back from Lechmere to North Station to allow the old Lechmere Elevated to be demolished and the Lechmere Viaduct connected to the Green Line Extension viaduct. Service will resume to the replacement elevated Lechmere station, with an extension to the new station, in 2021. From August 3–29, 2020, Prudential–Heath Street service was replaced by buses to allow for expedited track work. Seven grade crossings and of track were replaced during the closure. An additional monthlong closure between Heath Street and Brigham Circle is planned for August–September 2021.