Massachusetts Bay Transportation Authority

The Massachusetts Bay Transportation Authority is the state agency responsible for operating most public transportation services in Greater Boston, Massachusetts. The MBTA transit network includes the MBTA subway with three metro lines, two light rail lines, and a five-line bus rapid transit system ; MBTA bus local and express service; the twelve-line MBTA Commuter Rail system; and several ferry routes. In 2025, the system had a ridership of 270,715,800, or about 851,600 per weekday as of the first quarter of 2026, of which the rapid transit lines averaged 326,500 and the light rail lines 124,900, making it the fourth-busiest rapid transit system and the third-busiest light rail system in the United States. As of the first quarter of 2026, average weekday ridership of the commuter rail system was 104,000, making it the fifth-busiest commuter rail system in the U.S.