More than 100 passengers had to be escorted on foot through a Boston subway tunnel on Thursday night when three trains became stuck because of a signal problem, officials said.

The Massachusetts Bay Transportation Authority suspended Green Line service between Kenmore and Government Center stations because of a problem at the signal and track switch just west of Copley Station, an agency spokesperson said in an email Friday.

"Green Line experiencing delays of about 15 minutes due to signal problem at Copley Junction," the transit agency tweeted at about 9 p.m. Thursday.

BOSTON'S GREEN LINE SUBWAY OPENS EXTENSION FOLLOWING DELAY

"Three 2-car trains were between stations when service was suspended, and approximately 120 customers were safely escorted to the nearest station platforms," the spokesperson said.

Boston Green Line train

The Green Line train is show above in Medford, Massachusetts. The train got stuck on Jan. 26, 2023, causing over 100 passengers to have to be escorted on foot through the subway tunnel. (David L. Ryan/The Boston Globe via Getty Images)

No injuries were reported.

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"It’s not cool to be stranded this late at night when things shut down," passenger Lauren Collins told New England Cable News.

Service on the affected stretch of line was replaced with shuttle buses, but repairs to the switch were made overnight and regular Green Line service resumed on Friday morning, the agency said.