On a future Saturday, I have to take the train from Entre Campos to Porto. I have checked the web site and selected the train. However, on previous postings it was recommended to buy the ticket a few days before, since it is usually full, and seats are assigned by number. It was also noted that tickets could be obtained off the net. However, it is unlikely I will have access to a computer, when there, so plan to go to the Entre Campos station and buy a ticket a few days before. I would like to know where to buy the ticket at the station. I think it is unlikely a machine (as one does when going to Sintra). Also, are their many platforms at Entre Campos, and if so how does one know which platform to go to to catch the train? Also, is there some way to identify the train when it arrives so that I don't miss it? Any help will be appreciated greatly. Thanks.