A two-hourly RegionalExpress RE connects Lugano with the local towns and villages on the historic Gotthard route with the northern ones on the other side of the Ceneri, such as Bellinzona and Biasca, where the fast trains enter the world's longest railway tunnel in order to underpass the Alps, and further up through the Valle Leventina up to Airolo and through the old Gotthard Tunnel ( 1151 meters ) to the German-speaking northern villages in Uri as far as Erstfeld.