siemens.com/wincc-open-architecture Reference Report Traffic & Transport Gotthard Base Tunnel The Gotthard Base Tunnel – the world’s longest railway tunnel The Gotthard Base Railway Tunnel in Switzerland is currently under construction. It links Erstfeld in the Uri Valley with Bodio near Biasca in the Canton of Ticino. Following its completion, at 57 km (West Tunnel: 56,798 m, East Tunnel 57,091 m) it will be world’s longest railway tunnel. Inclu

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