If you're a fan of rail travel, make your next stop Tren de LOreneta. The displays here tell the story of the role trains have played in society.
You'll have sightseeing choices galore when spending time in Sarrià-Sant Gervasi. Tren de L'Oreneta is an ideal place to begin here, but there are numerous other worthy places to check out. Sagrada Familia, La Rambla, and Plaça de Catalunya are near the rail transportation exhibition and will round out your day nicely.