This is something you just have to look at: an amazing animated timeline of the Boston MBTA Subway over at Andrew Lynch’s Vanshnookenraggen blog (check out his future MBTA maps while you’re there).
To my mind, this work is far superior to the animated history of the New York Subway map that was floating around the interwebs a little while back: it’s clearly dated on the map, it’s fully annotated, and even has a slide show version below the animated GIF so you can flick through the years at your own pace. What’s fascinating to me is the almost complete reinvention of transit in Boston as the original elevated lines get torn down and replaced by subway.
An amazing work, and fully worthy of a 5 star rating. I’m not going to steal Andrew’s thunder by posting the full GIF here: click here to visit his site and watch the years roll by!