Ключевые слова: access, access control, accessibility, approval, authenticate, authenticity verification, automated, before departure, city, commute, control, electronic, enter, european, glands fast, identification, map, metro, modern, moving, pass, pass card, passcard, passenger, passengers, people, platform, porto, portugal, public, puncher, railway, reader, rush, sensor, stamping, station, system, tap, technology, terminal, ticket, tourist, train, train leaves, transport, travel, travel card, travel payment, urban, validate, validator, yellow,