The Massachusetts Bay Transit Authority (MBTA) is the public agency that operates the network of public transportation in the Boston area.
The Massachusetts Bay Transit Authority (Wikipedia) runs commuter trains, buses, a subway known as the T, ferries, and a paratransit service, all in the greater Boston area and centered in the city of Boston.
Use this tag for questions related to transportation services provided by the MBTA, including routes, fares, stations, etc.