On your return journey, conductors will check whether you have had your ticket stamped at the Álmok Álmodói 20 exhibition.
Should you have failed to do so, the price difference between the discount ticket and a full-price single ticket (or other discounted single ticket the travellers are entitled to) as well as the fine set out in Part 2a of Section C of Volume I of the Railway Ticket Prices must be paid upon ticket control.