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mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Ferrocarriles metropolitanos</topic></authority><related type="other"><topic>Construcción subterránea</topic></related><related type="broader"><topic>Transportes urbanos</topic></related><related type="broader"><topic>Ferrocarriles eléctricos</topic></related><variant type="other"><topic>Metro (Ferrocarriles)</topic></variant><variant type="other"><topic>Ferrocarriles subterráneos</topic></variant><variant type="other"><topic>Metropolitano</topic></variant></mads>