We plan to travel by FGC train from Barcelona-Plaça Espanya to Aeri de Montserrat and return on the same day. We prefer to purchase our tickets in advance. However, online options seem limited because we want to take the cable car to Montserrat and return to Barcelona via the cog train. It appears that if we were traveling round trip via one mode, we could get the tickets online.
We will be in Barcelona two days before our trip to Montserrat. Can these tickets be purchased at ticket stations other than Barcelona-Plaça Espanya? Also, do we need to validate the tickets before boarding, or can it be done onboard the train? Thank you for your help.