Service to the MBTA's Silver Line tunnel has resumed after loose pieces of concrete fell on the inbound platform of the station on Wednesday.
The concrete fell on the inbound platform of the MBTA's World Trade Center Station as a result of ongoing construction on Congress Street. No one was injured.
The tunnel had been closed from South Station to Silver Line Way. MBTA officials said regular service had resumed just after 5 a.m. Thursday.
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Following the incident, the MBTA said it ordered an engineering assessment to determine the extent of any structural damage that may have been caused by the construction project.
The Silver Line is a bus rapid transit system including bus lanes on some city streets and a road for buses only in the Seaport District.
Replacement bus service was run on surface streets until the tunnel was cleared for safe use. Buses continued stopping at all normal stops between South Station and Silver Line Way.