Red, Orange, Blue, Green, Silver - every line the Mbta runs, from Alewife and Oak Grove to Braintree and Wonderland, every branch of the famously complicated Green Line, every transfer point that Boston commuters know by heart.Boston is home to the oldest rapid transit system in the United States, and this puzzle features its official map - a piece of American transit history rendered in the color-coded clarity riders rely on every day.a perfect gift for Boston locals, Mbta riders, New England transplants, and anyone who has ever tried to explain the difference between the B, C, D, and E branches to someone visiting from out of town.