Sants, Barcelona’s biggest train station, located just west of the city centre, is on high speed international lines to Paris, Montpellier, Milan and Zurich, plus the AVE high speed line to Madrid and Valencia, the Euromed high speed line to Valencia and Alicante and the ARCO high speed line to Malaga and Seville. Sants also serves as regular lines—long distance (larga distancia), medium distance (media distancia) and local sububan trains, Rodalies. There are also two metro lines.
A bit confusingly, each kind of train has its own information desk or office. Before getting in a queue, see if you have to take a number to get a turn at the desk.
Image by JT Curses, Creative Commons License