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The 27.3 km long Semmering Base Tunnel is a major component of the Baltic‐Adriatic Corridor trans‐European rail link. The SBT2.1 Fröschnitzgraben Tunnel section involves more construction work than any other contract section of the Semmering Base Tunnel project. First, two shafts over 400 m deep had to be sunk down to tunnel level in order to create the emergency station. From here, the tunnels are...
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