The progress of the Brenner Base Tunnel connecting Austria and Italy
Undercrossing of the Eisack river BBT-SE
With a length of 64 kilometres, including the bypass of Innsbruck, the Brenner Base Tunnel will be the longest underground railway connection in the world. With construction works hitting important milestones, this is a good time to look back at those developments and, more in general, at the construction progress of the tunnel.
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The slope in the main tunnel is between four and seven per MILLE.