Planned maintenance will shut down one MBTA line for nine straight days and part of another for three weekends.

The 50- to 60-year-old steel cable probably “weakened until the point where it came down” after decades in a damp, subterranean tunnel, said Phillip Eng, the MBTA general manager.

The mishap on the Blue Line treated more than 460 train passengers to an unwelcome walking tour of Boston’s tunnel system.

TThe MBTA's Orange Line will be closed between Wellington and Back Bay stations from Aug. 2-3, 9-10 and 23-24. Free shuttles ...

More than 450 MBTA passengers were evacuated from a Blue Line train in the tunnel under the Boston Harbor due to a signal issue Tuesday afternoon.

The head of the MBTA said more problems were uncovered during an investigation into a Blue Line train evacuation​ that happened on Tuesday.

The changes to service in August will impact the Blue, Orange, Lowell, and Fitchburg lines, the MBTA announced.

The scheduled maintenance will add upwards of half-an-hour to commutes when the section of the Blue Line running between Airport Station and Wonderland is replaced by shuttle service.

Shuttle buses are replacing a portion of the Blue Line due to a signal issue at the Aquarium station, the MBTA said Tuesday.

The MBTA held its first board of directors meeting since nearly 500 passengers were evacuated from a Blue Line train after it ...

It took firefighters approx. 1 hr to evacuate 500 people from a ⁦ @MBTA ⁩ Blue Line train that was disabled under the harbor between Maverick & Aquarium station. They used the Nolan cart to transport ...

A partial shutdown of the Red Line began Thursday night and will remain in effect through Sunday, according to the MBTA.