While Boston has had a fantastic and varied streetcar history, possessing both the oldest subway in America and some of the longest-running revenue streetcar lines in the world, one of the biggest oversights we've had this month is discussing just how varied and unique some of Boston's streetcars actually are. We already touched on the differences between heavy- and light-rail systems, so now that we've established where these cars have run (and still do), we can dig deep and see what sets Boston's streetcar fleet apart from the rest of America. Climb aboard and indulge in your inner nerd as we excitedly discuss the different types of streetcars to grace the Boston Elevated Railway (BERy) and the Massachusetts Bay Transit Authority (better known, of course, as the MBTA).