The 0700's built by Siemens replaced the 0600's #4 cars in 2007. Seen at the new Airport with "MBTA Dog" at the controller. Here, trains switch between overhead and 3rd rail.
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.