Commuter train service was suspended for hours on part of the Lowell Line after a drill equipment malfunction that blocked a track in Somerville, the MBTA said.
Shuttle bus service was set up to replace trains between North Station and Anderson/Woburn. The diversion was caused by a drill rig failing while working on the Green Line extension project, according to the MBTA. It broke down near the commuter train tracks.
Normal service resumed about 7:15 p.m., according to the MBTA. There were still residual delays.
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"Thank you for patience while we removed the rig from the area," the agency tweeted.
Detours involved buses from the Orange Line's Wellington Station and a network of shuttle buses.