This investigation looked at how each agency — Long Island Rail Road (LIRR), Metro-North Railroad (MNR) and New York City Transit (NYCT) — handles ADA issues and the level of compliance achieved since the enactment of the 1990 legislation. It is clear from this study that the complex nature of these regulations, along with physical and financial constraints, has been a significant challenge to implementation. Most severely tested has been NYC Transit with its 100-year old subway system and its nearly 5,000 buses.