Rudolfplatz is an interchange station and hub on the Cologne Stadtbahn lines 1, 7, 12 and 15 in the Cologne district of Innenstadt. The station is located at Rudolfplatz, a major junction between the Cologne Ring and Aachener Straße.The station was opened in 1987 and is divided into an overground part for lines 1 and 7 and an underground part for lines 12 and 15.Notable places nearby Hahnentor Hohenzollernring entertainment district Millowitsch-Theater, Aachener Straße