You should be able to buy a ticket on the train after boarding, but not if:

  • deception is possible;
  • you needed to make a reservation;
  • there are commercial reasons (e.g. promotion ticket only via internet).

If there is no ticket office and no machine, you must be informed:

  • how you can purchase a ticket by telephone, via the internet or on the train;
  • where ticket offices and machines are.