As in Belgium and in the Netherlands conductors also collect and punch tickets, fine people for not having a valid fare and make announcements to the passengers. They also sell tickets on the trains; if the passengers have entered the train at a station where a ticket office is operating they can buy a ticket only with payment of a fine. However, if the passengers got on at a station or stop where they didn't have an option to buy a ticket, they can buy from the conductor without having to pay a fine.