The last tunnel, the fifty seven kilometres (35 mi) Gotthard Base Tunnel (a double-tube railway tunnel), opened in 2016. At about five hundred metres higher than sea stage, it provides for the first time a flat route in the massif plus the Alps through the northern plains at Erstfeld for https://experienceircsase08517.blogchaat.com/30420020/an-unbiased-view-of-gotthard-alternativroute