MBTA Jingle Bells Horn Show From Messerschmitt Bolkow Blohm (MBB) Cab Car 

Found this from spring 2018 at Wellesley Farms. This was one of the few years remaining for MBB Cab Cars on the southside. Today all MBB cab cars have been retired from MBTA except for occasional use for locomotive test trains at an MBTA test facility in south coast Massachusetts.