What if I ride from Cais do Sodre then stop at a station like Estoril. Can I get on the train with the same ticket or do I have to pay another fee? I am trying to get to Cascias but I want to see the casino they have in Estoril and make some money.
For the Estoril stop you do have to get out of a gate so you will have to swipe your Via Viagem card. Once you swipe you will be out of the system. So sadly, yes you will have to pay twice. The concept of the ticket is that for the 1,45 Euro you have 1 consecutive hour you are allowed to use the metro. With only one entry. So once you leave it you have to pay another 1,45.
Enjoy Estoril. The casino is nice.