— Line 6 or L6, coloured navy blue, (currently terminating at Plaça Catalunya - Reina Elisenda) is the name of a Barcelona Metro and Metro del Vallès service in the city of Barcelona operated by FGC, and part of the ATM fare-integrated transport system. Originally one among many other urban lines of the FGC network, and previously numbered U6, it shares tracks with other services in several stations, except the ones exclusive to its separate branch. L6 links Plaça de Catalunya, the city centre, with the district of Sarrià-Sant Gervasi.