The Metropolitan Transport Authority is a public consortium intended to coordinate the operation and project the expansion of the public transport system in the Barcelona metropolitan area. It is made up of the Government of Catalonia and local administrations. It has been known as ATM Àrea de Barcelona since 2003 to differentiate it from the other existing Catalan public transport authorities in the Girona, Camp de Tarragona and Lleida areas, which are also identified as ATM. As of January 2015, the ATM-managed public transport system comprises 50 different operating companies and serves 346 municipalities, accounting for a population of over 5.7 million.

The Tramvia Blau is one of Barcelona's three tram systems. It is a 1.276 kilometres (0.793 mi) long heritage streetcar line serving a hilly area of the Sarrià-Sant Gervasi district between the terminus of FGC Barcelona Metro L7 and the Funicular del Tibidabo.