Fares are sold at kiosks and at automated machines in the station foyer. Entrance to platforms is by automated gate, opened by smart cards and simple tickets. Gates return tickets for passengers to retain for the duration of the journey. There is normally no system to collect or check tickets at the end of the journey, and tickets can be inspected at any point. The exit from all stations is clearly marked as to the point beyond which possession of a ticket is no longer required.