Red Line service disrupted Thursday morning due to fire at Charles/MGH station

The undercarriage of an MBTA Red Line train caught fire at the Charles/MGH station on Thursday morning, according to the Boston Fire Department. The MBTA says a Green Line train also broke down at Heath Street station. No injuries were reported.

Firefighters say the incident on the Red Line occurred around 5:45 a.m., and passengers were all able to exit the train. Shuttle buses replaced subway service between Harvard and Broadway until 8:40 a.m., the MBTA indicated in a tweet.

The transit agency reported that the Boston Fire Department was on scene and MBTA maintenance crews had responded.

The incident comes just over two weeks after an overheated insulator caused a fire on the Orange Line tracks at Tufts Medical Center. Firefighters also responded to that incident and riders posted images on social media of smoke filling the station. The fire caused significant delays and suspension of subway service between North Station and Back Bay.

The Green Line's E branch also had service disruptions Thursday morning due to a disabled train at Heath Street. Service was temporarily suspended between Heath Street and Brigham Circle at 8:16 a.m., but resumed just before 9 a.m.

The MBTA has been plagued by a number of safety incidents in recent years, resulting in a federal investigation.