Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Massachusetts Bay Transportation Authority. MBTA Commuter Rail, MBTA Bus, MBTA accessibility, CharlieCard, History of the MBTA, Massachusetts Executive Office of Transportation, Big Dig, North-South Rail Link, List of United States commuter rail systems by ridership, Peabody, Massachusetts, Massachusetts, Massachusetts Bay Transportation Authority Police, Cambridge, Massachusetts.