BOSTON (WHDH) - The MBTA experienced delays Tuesday morning after a power surge impacted the signal system on multiple lines.

Transit officials reported the issue around 7:30 a.m. Power was restored about ten minutes later and signal systems came back online about 30 minutes later, with some signal problems persisting throughout the morning at locations including Forest Hills on the Orange Line and at Copley on the Green Line.

Officials said the power surge occurred when a transformer failed, tripping a circuit breaker at the MBTA power facility in South Boston.

State Transportation Secretary Gina Fiandaca addressed the incident when speaking at an event later in the day.

“It does take a little bit of time for the system to catch back up after a power outage like that, but they are working hard to get all the information out to our riders,” Fiandaca said.

The T said in a statement Tuesday afternoon that root cause of the transformer failure is under investigation.

The T said it “will use all resources” in its review.

“We’ll take the appropriate measures to reinforce our system further to protect against possible outages,” the T continued.

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