The Green Line is a semi-metro system run by the Massachusetts Bay Transportation Authority in the Boston, Massachusetts, metropolitan area. It is the oldest MBTA subway line, and with tunnel sections dating from 1897, the oldest subway in North America. It runs underground through downtown Boston, and on the surface into inner suburbs via six branches on radial boulevards and grade-separated alignments.
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Coordinates 42°22'20.246" N -71°4'41.19" E
