This Google Image Search brings up some interesting photos of the MBTA. I was amazed by the wide variety of rolling stock in the Boston area. Some lines had quaint, old cars (I like the Green Line best); and others had very modern equipment. When I first rode the MBTA in 1972, I found it more thrilling than a roller coaster. I rode it several times in the late 1990's when my sister lived in the area, and I found it less exciting but quite comfortable.
-Joe-