There is a lot to see in this image. Blue and Black Conrail diesels, MBTA E units, MBTA GP9, Old New Haven and NYC coaches and autos from the 70's.
It almost looks like a railroad museum or ralifan day in Rhode Island.
The 70's and 80's were a transition period for the MBTA characterized by an eclectic mix of equipment including Budd RDC's, ex-New Haven stainless steel coaches, and a mix of motive power acquired from various railroads.