at Heidelberg autobahn intersection in the city of Heidelberg, and the A 656 connects to the A 6 at the Mannheim autobahn intersection, which connects to the east towards Stuttgart. Furthermore, the B 3 (Frankfurt–Karlsruhe) runs north–south through the town, and the B 37 (Mannheim–Eberbach) runs east–west. Both meet in the city center at the Bismarckplatz. The B 535 begin in the south of Heidelberg and runs to Schwetzingen. Tourist roads Heidelberg is located on four tourist roads: Bergstraße, Bertha Benz Memorial Route, Castle Road, and Straße der Demokratie (Road of Democracy). Railways Heidelberg Central Station (Hauptbahnhof) is on the Rhine Valley Railway and is served by Intercity-Express, Euro City trains. This station is served by the RheinNeckar S-Bahn. There is also a station for intercity bus services outside the central station. Public transport The main transport hub of Heidelberg is the Bismarckplatz. Several main thoroughfares of the city intersect here and one of the longest pedestrian streets in Europe, the Hauptstraße (main street) runs from here through the entire old town of Heidelberg. Heidelberg Central Station was nearby for many years, which was a combined terminal and through station. In 1955, it was moved about 1.5 km further to the west, which removed the necessity for trains continuing to the south or from the south to the north to reverse. The new central station became the second major transport hub of Heidelberg. Heidelberg has had a public transport service since 1883, when horse-drawn trams were established. Due to the rapidly rising patronage it was decided on 20 December 1901 to convert the Heidelberg tramway network to electrical operation. On 16 March 1902, the first electric tram ran on Rohrbacher Straße, sharing use of the suburban tracks built by the Deutsche Eisenbahn-Gesellschaft in 1901 between Heidelberg and Wiesloch. Until the 1950s, the tram network was expanded a bit at a time. The rapidly growing popularity of car transport presented the operator of the trams with increasingly difficult problems and the tram network was gradually dismantled. It was not until 10 December 2006 that the network was extended again with the opening of a new tram line from Kirchheim. Tram and bus services are now operated by Rhein-Neckar-Verkehr (RNV). Since 1989, all fares are set under a uniform scheme by the Verkehrsverbund Rhein-Neckar (Rhine-Neckar Transport Association, VRN). Carsharing increasingly provides a complement to public transport. More than 50 car-sharing stations are