The final tunnel, the fifty seven kilometres (35 mi) Gotthard Base Tunnel (a double-tube railway tunnel), opened in 2016. At around 500 metres above sea degree, it provides for The very first time a flat route through the massif as well as the Alps with the northern plains at Erstfeld https://travelingnursebiz74949.bloginwi.com/64141795/everything-about-gotthard-alternative-routes