At the Sedrun sub-section, two 6.5 km long tunnels run through the project’s most complicated and dif- ficult geological zones. Also in this section is one of the Gotthard Base Tunnel’s two multifunction stations that house crossovers, emergency stop stations, and technical instal- lations for railway operations and ventilation. With more than 2000 metres of overlying mountain, tunnelling through the unstable rock of the T avetsch intermediate m

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