High Quality Content by WIKIPEDIA articles! Physical accessibility on the Massachusetts Bay Transportation Authority (MBTA or "the T") system is incomplete but improving, with accessibility on all buses (including the Silver Line), all Orange Line stations, all but 2 Red Line stations, and all but 2 Blue Line stations. As is true for most mass transit systems, much of the Boston subway and commuter rail lines were built before wheelchair access was a requirement. The Boston system underwent significant expansion in the 1980s and 1990s, and all the new facilities are ADA compliant. The MBTA has also refurbished many stations, and these too are accessible. More improvements are in progress or expected as part of planned construction.