Looking for a map of the R line on the Madrid metro? It serves 2 stations over roughly 0.9 km. It runs between Príncipe Pío and Ópera. This page gathers its route, the list of its stations and its interchanges.
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2 of its stations interchange with another line. For the record, its oldest station is Ópera (1925) and its busiest is Príncipe Pío (12,043,828 passengers a year).