The crash happened at the East High Street crossing at about 11:45 a.m., said MBTA spokesman Joe Pesaturo.
It was unclear why the car was on the tracks. The warning gates were in the down position, Pesaturo said in a statement.
He said the driver, Ann Kireilis, 91, of Brockton, was “conscious and alert” when transported to Brockton Hospital. A hospital spokeswoman said Kireilis was in stable condition this afternoon.
The accident involved Old Colony Train 014. Buses were dispatched to the scene to provide for the passengers, Pesaturo said.
By shortly after 1 p.m., the train had been released by investigators, and regular service was resuming on the Middleborough/Lakeville Line, he said.
The incident is under investigation by the MBTA Transit Police, he said.
UPDATE: Driver dies after crash with train
The elderly driver whose car was hit Thursday by a Boston-bound commuter train at a crossing in Avon has died, officials said.
The driver, Ann Kireilis, 91, of Brockton was taken to Brockton Hospital after the accident at the East High Street crossing at about 11:45 a.m. Thursday. A hospital spokeswoman confirmed today that she had died.
Investigators checking the crossing’s warning system found it was activated 39 seconds before the train arrived at the crossing, MBTA spokesman Joe Pesaturo said in a statement.
The warning gates were in the down position when the accident took place, he said.
He said the engineer applied the emergency brake when he saw the car, but was unable to stop before hitting the car.
The accident remains under investigation.