The Massachusetts Bay Transportation Authority (MBTA) system is mostly but not fully accessible. Like most American mass transit systems, much of the MBTA subway and commuter rail were built before wheelchair access became a requirement under the Americans with Disabilities Act of 1990. The MBTA has renovated most stations to be compliant with the ADA, and all stations built since 1990 are accessible. The MBTA also has a paratransit program, The Ride, which provides accessible vehicles to transport passengers who cannot use the fixed-route system.
Much of the MBTA subway system is accessible: all Orange and Red Line stations, and all but one Blue Line station, are accessible. Most of the underground portion of the Green Line is accessible, though only some surface stops are; all but one stop on the Ashmont–Mattapan High-Speed Line are accessible. About three-quarters of the MBTA Commuter Rail system is accessible, including the North Station and South Station terminals. All buses (including the Silver Line) and all MBTA boat services are accessible.