The MBTA says a signal problem led to a shutdown of part of the Green Line in Boston Thursday night.
More than 100 passengers had to be escorted on foot through a subway tunnel when three trains became stuck, officials said.
Shuttle buses replaced trains between Kenmore and Government Center because of a problem at the signal and track switch just west of Copley Station, according to the MBTA. There was a large police response to Copley Square, where the signal issue took place.
“Three 2-car trains were between stations when service was suspended, and approximately 120 customers were safely escorted to the nearest station platforms,” a spokesperson for the transit agency said.
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Shortly after midnight Friday, the MBTA said service had resumed with 15-minute delays. The issue was repaired overnight.
No injuries were reported.
"It's disappointing. I mean, I rely on the MBTA to get around the city, I don't have a car," said passenger Andrew Putnam. "You expect public transit to work, and when it doesn't work, it's a little frustrating, especially when the prices continue to go up and the service doesn't seem to be getting better."
"There's just been a lot of things that have happened, and they really need to comply with federal regulations," said rider Lauren Collins. "It's not cool to be stranded this late at night when things shut down."
No further details about the signal problem were released.
The incident happened just hours after shuttle buses had replaced service on part of the Red Line due to a crash on Interstate 93.
The Associated Press contributed to this report.