Americans with Disabilities Act (ADA) of 1990 (with amendments issued through 2008)

(II) Commuter rail

Key stations in commuter rail transportation systems shall be made readily accessible to and usable by individuals with disabilities, including individuals who use wheelchairs, as soon as practicable but in no event later than 3 years after July 26, 1990, except that the time limit may be extended by the Secretary of Transportation up to 20 years after July 26, 1990, in a case where the raising of the entire passenger platform is the only means available of attaining accessibility or where other extraordinarily expensive structural changes are necessary to attain accessibility.