A tractor-trailer truck pulling a 40-foot trailer through Beacon Hill Thursday apparently lost its brakes, traveled down Walnut Street, crossed Beacon Street, and then came to a stop after the cab rolled down a set of steps leading into Boston Common, officials said.
Firefighters deployed equipment to stabilize the cab while efforts were made to safely unload diesel fuel from the vehicle, said Lieutenant Michael Walsh of the Boston Fire Department.
Walsh said that the driver was uninjured and that it appeared the vehicle’s brakes had failed.
He said the vehicle was pulling an empty car-hauling trailer. “It went in nose-first and ended with the rear wheels up in the air,’’ Walsh said.
The truck did not leak any fuel, said Fire Department spokesman Steve MacDonald.
Later in the afternoon, firefighters removed the vehicle, and traffic was back to normal in the area.
The accident remains under investigation.
Michael Levenson of the Globe staff and correspondent Trisha Thadani contributed.