The Massachusetts Bay Transportation Authority (MBTA) system is shown on a map in a logo on the sides of the vintage PCC streetcars operating on the 2.6-mile Ashmont to Mattapan “High Speed Line,” which is en extension of the Red Line south out of Boston.
The MBTA is very dear to me. The first trains I ever rode as a toddle to teenager were those of the "T" Here is a collection of MBTA Subway and trolley I have found on RP from the 60's thru today.