The Barcelona Metro ( Catalan and Spanish : Metro de Barcelona ) , part of the public transportation system of Barcelona , Spain is an extensive network of electrified railways that run underground in central Barcelona and above ground into the city 's suburbs . The Barcelona Metro ( Catalan and Spanish : Metro de Barcelona ) , part of the public transportation system of Barcelona , Catalonia , Spain , is an extensive network of electrified railways that run underground in central Barcelona and above ground into the city 's suburbs .