I'm travelling from Lisboa Oriente to Guarda next week. I hope to catch the 13:39 direct train, but I'm not sure if I can make it. There is a later, indirect and slower connection departing 14:09 (that I can certainly catch, but I would much prefer the 13:39 connection).
The terms and conditions state that The tickets are personal and unalienable and they are only valid for the days and trains mentioned on them. Is there any way I can buy a ticket in advance that is valid for either connection? I may be short on time to buy a ticket on the station (I have a meeting near the airport that finishes 20 minutes before the 13:39 departure). I may be able to get to the station the day before.