Line 6 , colored navy blue , ( currently known as PlaÃ a Catalunya - Reina Elisenda ) is the name of a metro-like commuter train service in Barcelona operated by FGC , and part of the ATM fare-integrated transport system . â '' Line 6 , colored navy blue , ( currently known as PlaÃ a Catalunya - Reina Elisenda ) is the name of a metro-like commuter train service in Barcelona operated by FGC , and part of the ATM fare-integrated transport system .