Ildefons Cerdà is a station in the Barcelona Metro network, served by FGC-operated L8, among other Rodalies Barcelona and FGC suburban lines. It's not properly in Plaça d'Ildefons Cerdà (a square in the Sants-Montjuïc district of Barcelona proper, but just next to L'Hospitalet de Llobregat) but in the L'Hospitalet part of Gran Via de les Corts Catalanes.