Thinking about options for subway/commuter integration in Boston: 2 new major tunnels, streetcar loop downtownpic.twitter.com/FcSnFsVx2C
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Blue Line extension parallel or beneath Red Line as far as Harvard, then to Framingham Line in Newton, via Watertown
Green line under Washington St to Dudley, then Blue Hills Ave to near Mattapan, where it joins Fairmount Line
Such tunnels would be much longer than a North-South link, but wouldn't be jostling for space w Big Dig or skyscraper foundations
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