The physical accessibility of the Metropolitan Transportation Authority (MTA)'s public transit network, serving the New York metropolitan area, is incomplete. Although all buses are wheelchair accessible in compliance with the Americans with Disabilities Act of 1990 (ADA), much of the MTA's rail system was built before wheelchair access was a requirement under the ADA. This includes the MTA's rapid transit systems, the New York City Subway and Staten Island Railway, and its commuter rail services, the Long Island Rail Road (LIRR) and Metro-North Railroad. Consequently, most stations were not designed to be accessible to people with disabilities.