Follo Line Rail Tunnels, Norway’s Biggest Rail Project

Twin tunnels, each 19.5 km long with an internal diameter of 8.8 meters, will connect the cities of Oslo and Ski, establishing the central axis of the intercity development to the south of the Norwegian capital.
Designed for trains running at 250 kmph, carrying passengers between the two cities, both tunnels have been drilled by four huge double-shield Tunnel Boring Machines (TBMs), named Anna de Kloppa, Magda Flåtestad, Queen Euphemia and Queen Elisiv in honor of four of the country’s bravest and most enterprising women.
The challenging job of drilling the tunnels also involved blasting caves for the TBMs, rescue tunnels (including a 2.7-km-long escape tunnel) and two 420-meter-long transport tunnels. The consortium, formed by ACCIONA and Ghella, will also construct all the project’s railway installations except the signaling systems. Resilient transport infrastructure bringing well-being and progress to Norwegian society.

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