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Third Follo Line tunnel boring machine completed

Manufacture of the third tunnel boring machine (TBM) for Norway’s new Follo Line rail tunnel has been completed in Germany as parts for the first two start to be assembled on site.

The Herrenknecht TBM will now be dismantled ready for transport to Norway while manufacturing work on the fourth machine for the new rail line continues.

The 9.9m diameter Herrenknecht hard rock TBM will be used by the Acciona Ghella Joint Venture (AGJV) to drive tunnels on the Follo Line which will connect Oslo and Ski by rail.

The TBM will be used to bore 9km of the southbound tunnel on the new 20km tunnel between Oslo and Ski. The tunnel will be the longest rail tunnel in Norway when completed in 2021.

According to AGJV, the colour of the TBM was inspired by the Norwegian flag with the cutter head in blue and cutting discs in red.

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