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Red Line service resumes after fire on tracks outside Porter Square station

The Red Line was delayed Saturday night due to a fire.
The Red Line was delayed Saturday night due to a fire. –Aram Boghosian / The Boston Globe

Red Line service has resumed after firefighters responded to a fire on the tracks outside Porter Square station, the MBTA said.

“A third rail insulator was smoldering,’’ MBTA spokesman Joe Pesaturo said in an e-mail.

The fire was “quickly extinguished,’’ Pesaturo said.