Stock Photo - Hard rock gripper tunnel boring machine Herrenknecht AG called ´Sissi´, this Tunnel Boring Machine - TBM was used at the Gothard tunnel in Switzerland, diameter 8,83 meters, a model of a gripper TBM and other key items involved in building the Swiss railway tunnels can be seen in front of Swiss Museum of Transport in Lucern, Verkehrshaus der Schweiz, Lucerne, Switzerland

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