Ключевые слова: automated, automatic, behind, boarding, booking, checking, city, computer, consumer, customer, destination, device, discount, display, electronic, female, gadget, hand, interface, machine, metro, money, passenger, pay, paying, payment, people, public, purchase, rail, railway, retail, screen, smart, station, subway, system, technology, terminal, ticket, ticketing, train, transaction, transport, transportation, travel, trip, underground, urban, woman,