metro

The Barcelona Metro (Catalan and Spanish: Metro de Barcelona, Catalan: [ˈmɛtɾu ðə βərsəˈɫonə], Spanish: [ˈmetɾo ðe βarθeˈlona]), part of the public transportation system of Barcelona, Catalonia, is an extensive network of electrified railways that run underground in central Barcelona and above ground into the city's suburbs. Since September 20, 2011, Barcelona Metro system consists of 11 lines with 166 stations and 125 km in total. In 2002 ATM announced that two additional lines would built in the near future, L12 and L13. There have been 3 driverless lines since 2009: Line 11, Line 9 and Line 10, in chronological order.

A rapid transit, underground, subway, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic. Rapid transit systems are typically located either in underground tunnels or on elevated rails above street level. Outside urban centers, rapid transit lines may run on grade separated ground level tracks.

Service on rapid transit systems is provided on designated lines between stations using electric multiple units on rail tracks, although some systems use guided rubber tyres, magnetic levitation, or monorail. They are typically integrated with other public transport and often operated by the same public transport authorities. Rapid transit is faster and has a higher capacity than trams or light rail (but does not exclude a fully grade separated LRT), but is not as fast or as far-reaching as commuter rail. It is unchallenged in its ability to transport large amounts of people quickly over short distances with little land use. Variations of rapid transit include people movers, small-scale light metro and the commuter rail hybrid S-Bahn.