274,000 kilometres daily. Half of these train services are long distance services; the other half are regional and suburban services. In 2013, 366 million passengers used the Swiss Federal Railways. Rail transport in Switzerland also includes a car and truck transportation service (German: Autoverlad) on some lines. Urban rail Urban commuter rail networks are focused on the country's major cities: Zurich, Geneva, Basel, Bern, Lausanne and Neuchâtel. Lausanne is the only city with a metro system (Lausanne Metro), which includes two lines: one is light rail; the other, a fully automated metro, opened in 2008. After its opening, Lausanne replaced Rennes as the smallest city in the world to have a full metro system. Maglev In response to the increasing need for transport capacity and the cost of ground surface infrastructures, an underground transportation system has been proposed and studied. The trains would use linear motor and magnetic levitation to reach speeds about 500 km per hour. The project is not likely to be realized in the near future, but a license for application has been deposited for a trial line between Geneva and Lausanne. Mountain rail Trains cannot climb steep gradients, so it is necessary to build large amounts of track in order to gain height gradually. Transversals through the Alps were made possible with the use of hidden circular tunnels, which are called Spiral. In the case of extremely mountainous terrain, railway engineers opted for the more economical narrow gauge construction. The many railway viaducts of the Rhaetian Railway in the canton of Graubünden, built for the most part in the early 20th century, have become a tourist attraction as well as a necessary transport system, drawing rail enthusiasts from all over the world. Some railways were built only for tourist purposes as the Gornergrat or the Jungfraujoch, Europe's highest station in the Bernese Oberland, at an altitude of 3,454 metres (11,330 ft). Roads Switzerland has a network of two-lane national roads. These roads usually lack a median or central reservation. Some stretches are controlled-access, in that all traffic must enter and exit through ramps and must cross using grade separations. Two of the important motorways are the A1, running from St. Margrethen in northeastern Switzerland's canton of St. Gallen through to Geneva in southwestern Switzerland, and the A2, running from Basel in northwestern Switzerland to Chiasso in southern Switzerland's canton of Ticino, using the Gotthard Road Tunnel.