The Hallandsås Tunnel Project was a major railway infrastructural project in Sweden associated to a long history. It was opened to the public end of 2015. In 2004, the third attempt to complete the construction of the two tunnels started, based on an alternative technical solution involving excavation with a 10.6m diameter dual mode hard rock Mix-Shield TBM, which was a complex machine capable of being operated in open mode, closed mode (slurry) up to 13 bars and to undertake…