What guidelines exist with regard to Americans with Disabilities act (ADA) compliance for fare vending machines?

Accessibility requirements for fare vending machines are established by the U.S. Architectural and Transportation Barriers Compliance Board (ATBCB or “Access Board”), the Federal agency responsible for developing minimum guidelines for accessibility under the Americans with Disabilities Act (ADA). These guidelines were updated by the Access Board in 2004, and incorporated into Department of Transportation (DOT) Americans with Disabilities Act (ADA) regulations as the enforceable standard for transportation in November 2006; specific requirements may therefore differ slightly, depending upon when the fare machine was made and installed. The current standards are found in Section 707 of the Americans with Disabilities Act Accessibility Guidelines, which can be found at https://www.access-board.gov/guidelines-and-standards/buildings-and-sit…. In particular, Section 707 discusses fare machine requirements such as clear floor space, operable parts, privacy, and speech-enablement.