The MBTA plans to close parts of the Red and Green Line for track work this weekend.
Shuttle buses will replace service between JFK/UMass and Ashmont stations on the Red Line Saturday and Sunday, and on the D Branch of the Green Line for the next seven days.
The Green Line diversion concludes 25 days worth of work on the D Branch, which was also closed from Sept. 24 to Oct. 2 and Oct. 8-16 for 4,000 feet of track replacement.
“During the third and final closure, crews will fully reconstruct another 2,000 feet of track and replace two pedestrian crossings at Eliot station,” said Angel Peña, the T’s chief of capital transformation.
The installation of $212 million train-collision prevention equipment along the D Branch will continue as well throughout this particular service disruption, which will extend through Oct. 28, a T spokesperson said.
The project is ending two days ahead of schedule, the T said, and no additional work is planned for the Green Line this year. The B, C and E branches were closed at various points over the summer for similar construction.
On the Red Line, crews will be conducting signal cabling work at the new Ashmont signal house, and prep work for the Codman Yard expansion project, the MBTA said.
A two-day diversion occurred last Saturday and Sunday on the Red Line as well, between Alewife and Harvard stations. Shuttles buses also replaced trains on other parts of the line during the first six days of October.
A number of speed restrictions are in place along the Red Line to prepare for additional construction that the MBTA said it is currently working to schedule.
Service was also impacted on the Blue Line this week, first for nighttime track work on Monday, and then because of a power outage that began at 11 p.m. Thursday.
MBTA spokesperson Joe Pesaturo said the disruption in power was rectified at 2:15 a.m. Friday, an hour after the end of regularly scheduled subway service.
“The Blue Line has emergency power generators that provide supplemental lighting on platforms, but stations between Maverick and Orient Heights had limited lighting,” he said.
“Trains did not lose power, but they experienced delays because the signal system’s power was impacted.”
The cause of the blackout is under investigation, and the Blue Line was back on its regular schedule by the start of service Friday morning, Pesaturo said.