49 CFR 38.53 - Doorways.

§ 38.53 Doorways.
(a) Clear width.
(1) Passenger doorways on vehicle sides shall have clear openings at least 32 inches wide when open.
(2) If doorways connecting adjoining cars in a multi-car train are provided, and if such doorway is connected by an aisle with a minimum clear width of 30 inches to one or more spaces where wheelchair or mobility aid users can be accommodated, then such doorway shall have a minimum clear opening of 30 inches to permit wheelchair and mobility aid users to be evacuated to an adjoining vehicle in an emergency.
(b) Signage. The International Symbol of Accessibility shall be displayed on the exterior of accessible vehicles operating on an accessible rapid rail system unless all vehicles are accessible and are not marked by the access symbol. (See Fig. 6.)
(c) Signals. Auditory and visual warning signals shall be provided to alert passengers of closing doors.
(d) Coordination with boarding platform—
(1) Requirements. Where new vehicles will operate in new stations, the design of vehicles shall be coordinated with the boarding platform design such that the horizontal gap between each vehicle door at rest and the platform shall be no greater than 3 inches and the height of the vehicle floor shall be within plus or minus 5/8 inch of the platform height under all normal passenger load conditions. Vertical alignment may be accomplished by vehicle air suspension or other suitable means of meeting the requirement.
(2) Exception. New vehicles operating in existing stations may have a floor height within plus or minus 11/2 inches of the platform height. At key stations, the horizontal gap between at least one door of each such vehicle and the platform shall be no greater than 3 inches.
(3) Exception. Retrofitted vehicles shall be coordinated with the platform in new and key stations such that the horizontal gap shall be no greater than 4 inches and the height of the vehicle floor, under 50% passenger load, shall be within plus or minus 2 inches of the platform height.

Title 49 published on 2014-10-01

no entries appear in the Federal Register after this date.

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United States Code
U.S. Code: Title 42 - THE PUBLIC HEALTH AND WELFARE

§ 12101 - Findings and purpose

§ 12102 - Definition of disability

§ 12103 - Additional definitions

§ 12111 - Definitions

§ 12112 - Discrimination

§ 12113 - Defenses

§ 12114 - Illegal use of drugs and alcohol

§ 12115 - Posting notices

§ 12116 - Regulations

§ 12117 - Enforcement

§ 12131 - Definitions

§ 12132 - Discrimination

§ 12133 - Enforcement

§ 12134 - Regulations

§ 12141 - Definitions

§ 12142 - Public entities operating fixed route systems

§ 12143 - Paratransit as a complement to fixed route service

§ 12144 - Public entity operating a demand responsive system

§ 12145 - Temporary relief where lifts are unavailable

§ 12146 - New facilities

§ 12147 - Alterations of existing facilities

§ 12148 - Public transportation programs and activities in existing facilities and one car per train rule

§ 12149 - Regulations

§ 12150 - Interim accessibility requirements

§ 12161 - Definitions

§ 12162 - Intercity and commuter rail actions considered discriminatory

§ 12163 - Conformance of accessibility standards

§ 12164 - Regulations

§ 12165 - Interim accessibility requirements

§ 12181 - Definitions

§ 12182 - Prohibition of discrimination by public accommodations

§ 12183 - New construction and alterations in public accommodations and commercial facilities

§ 12184 - Prohibition of discrimination in specified public transportation services provided by private entities

§ 12185 - Study

§ 12186 - Regulations

§ 12187 - Exemptions for private clubs and religious organizations

§ 12188 - Enforcement

§ 12189 - Examinations and courses

§ 12201 - Construction

§ 12202 - State immunity

§ 12203 - Prohibition against retaliation and coercion

§ 12204 - Regulations by Architectural and Transportation Barriers Compliance Board

§ 12205 - Attorney’s fees

§ 12205a - Rule of construction regarding regulatory authority

§ 12206 - Technical assistance

§ 12207 - Federal wilderness areas

§ 12208 - Transvestites

§ 12209 - Instrumentalities of Congress

§ 12210 - Illegal use of drugs

§ 12211 - Definitions

§ 12212 - Alternative means of dispute resolution

§ 12213 - Severability

U.S. Code: Title 49 - TRANSPORTATION