CP - Trains of Portugal joined the Porto/Post/Doc so you do not miss anything of the second film festival.
2 euros, round trip, is the price for the train ticket to the festival. By submitting a ticket to the sessions of Porto/Post/Doc, at the box office of CP, or on board of the train in the day of travel, the trip will cost only 2 euros round trip, between any network station of CP and Porto, where the festival is held. Valid for travel on the date of the ticket.
From the 25th November you will be able to buy cheaper train tickets.
See how you can arrive, at the CP site.