Line 7 or L7 colored brown ( currently known as PlaÃ a Catalunya - Avinguda Tibidabo ) , is a metro in the Barcelona Metro network that is ran by FGC . â '' Line 7 , colored brown ( currently known as PlaÃ a Catalunya - Avinguda Tibidabo ) , is a metro-like commuter train line in the Barcelona Metro network operated by FGC , and part of the ATM fare-integrated transport system .