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The Circle Line would be the MBTA's 5th rapid transit line, and 1st since the Red Line opened in 1912. It would be a 17 mile loop, roughly 2 - 4 miles outside of downtown Boston, connecting the neighborhoods of Charlestown, East Boston, South Boston, Dorchester, Roxbury, Fenway, Allston, and the cities of Brookline, Cambridge, and Somerville. Ridership would be around 300,000 per weekday, with the potential to grow to 400,000.
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