A Green Line E train bound for Heath Street caught fire at North Station late Thursday, Sept. 10, sending smoke and flames from the roof before Boston firefighters arrived.

No one was injured.

The E branch runs from North Station through downtown Boston and into Jamaica Plain, passing through Boston neighborhoods including Longwood and Riverway. Riders on that stretch felt the disruption: the fire caused 15-minute delays across the Green Line, the MBTA reported.

The pantograph, the roof-mounted arm that connects the trolley to the overhead power wire, began smoking and then burning around 11 p.m., Universal Hub reported, citing the Massachusetts Bay Transportation Authority (MBTA). By the time Boston firefighters reached the platform at about 11:08 p.m., the smoke and flames had gone out on their own.

Boston firefighters declared an all-out at 11:25 p.m. The MBTA said at 11:55 p.m. that normal service had resumed. The agency pulled the damaged train from service.

No cause for the fire has been publicly reported. The MBTA has not released a statement explaining what went wrong with the pantograph or whether inspections of other trolleys are planned.

The North Station fire came one day after a separate MBTA incident on Wednesday, Sept. 9, when a Providence/Stoughton Line commuter-rail diesel began belching smoke at Ruggles station around 1:40 p.m. Boston firefighters knocked that fire down by 1:49 p.m. The Ruggles blaze also disrupted Amtrak service along the Northeast Corridor.

Two MBTA fires in two days followed weeks after Gov. Maura Healey referenced the system's troubled history. At a July 28 news conference in Belmont, Healey told reporters, "We had trains on fire, three-and-a-half years ago, four years ago … So that was the first thing, to stabilize the system," Patch reported.

The MBTA has not announced any investigation or follow-up action related to the Sept. 10 pantograph fire.