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The pink line, mostly underground, links Plaça Espanya, in Barcelona proper, with Sant Boi de Llobregat, through L'Hospitalet de Llobregat. It opened in 1912 as a narrow gauge train line (hence predating the first metro Line 3 by 12 years), and was known as S3 until 2003, hence the name of its suburban extended line (S33). It's also part of the Llobregat-Anoia and Metro del Baix Llobregat railway networks run by FGC, from which trains continue from Molí Nou-Ciutat Cooperativa onwards. There is also a freight-only branch line before Sant Boi station that connects to the Port of Barcelona.
The line first took on its current form between 1985 and 1987 when the section Cornellà-Riera – Sant Josep was first moved underground, followed by the section Sant Josep – Espanya. In 1997 Magòria-La Campana station opened, followed by Molí Nou – Ciutat Cooperativa station in 2000.
