The RS guidebook to Barcelona seems to take it as inevitable that you will have to go through Sants station and then get on L3 if you're coming or going from outside the city, but I see that (sort of like the RER in Paris) there is suburban rail between the Placa de Catalunya and Passeig de Gracia stations and both Girona to the northeast and Tarragona to the southwest.
I'm having trouble understanding the lines, schedules, and stations not only because of the language barrier but because the design of the websites is little overdone. Can anyone point me to a clear(er) explanation/listing of what lines R11 and RG1 do to get one from Girona to the old city center of Barcelona? Same for the lines to Tarragona?
This is the site that is proving confusing: http://rodalies.gencat.cat/ca/linies_estacions_i_trens/servei_regionals/