Getting around by metro Boston

MTBA is Boston's transportation network (subway, bus, streetcar and commuter rail). Boston's subway serves the entire city, as well as its suburbs (including Cambridge and Brookline). There are five main lines (blue, orange, green, grey and red) that branch off in several directions, signified by letters. To get your bearings, know that Outbound (under the station name) means you are leaving the city, Inbound means you are entering the city.