The Massachusetts Bay Transportation Authority is fast-tracking work on the Green Line's D branch in June that will require a full closure of the track for a total of 18 days, officials said.
The MBTA's Green Line D Track and Signal Replacement Project includes replacing 25,000 feet of track and 6.5 miles of signals -- some elements of which date to the 1950s -- from Riverside to Beaconsfield stations, the T said.
Beginning after the end of normal service on Friday, crews will work 24 hours a day for a total of 18 days to perform the work.
Starting June 12, through June 20, train service will be replaced with shuttle buses between Riverside and Kenmore, the MBTA said.
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Shuttles will also be used from June 24 through July 2. MBTA General Manager Steve Poftak said the work will make the service safer and more reliable.