The final tunnel, the 57 kilometres (35 mi) Gotthard Base Tunnel (a double-tube railway tunnel), opened in 2016. At close to 500 metres over sea degree, it provides for the first time a flat route through the massif and also the Alps in the northern plains at Erstfeld for the https://yingchenkuo37925.xzblogs.com/71597162/an-unbiased-view-of-gotthard-alternativroute