The city runs a small rather effective system of trams and buses. The two most important nodal points are the main station and Bismarckplatz. Bus #32 and #33 connect the main train station (Hauptbahnhof) with the old city area; detailed maps, schedules and routes can be found online. A mountain railway runs between four stations (including the castle), linking the old city on the level of the river with the summit of the Königstuhl Mountain, about 400m (1312 feet) above the city. The "Heidelberg Card," a tourist pass that includes public transportation, many museums, and the lower section of the mountain railway (a separate fare is required for the upper section), can be bought at the tourist information centre located just outside the main station.