The MBTA (T) was looking for a replacement for the whole fleet of PCC cars. One manufacturer sent two Canadian Light Rail Vehicles for a demonstraion on the T. This CLRV is on the Cleveland Circle route.
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.