Mont d'Ambin Base Tunnel

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The Mont d'Ambin base tunnel (also known as the Mont Cenis base tunnel[1]) is the largest engineering work of the Lyon–Turin rail link project. Reconnaissance work began on the French side in 2002 with the excavation of access points at Modane, then Saint Martin la Porte (2003) and La Praz (2005),[2][not in citation given] and on the Italian side in 2011 at La Maddalena.[3] Construction has yet to start officially, but the 9 km reconnaissance gallery that is being tunneled from Saint Martin de la Porte towards Italy is bored along the axis of the South tube of the tunnel and at its final diameter.[4]


Following protests against the original alignment of the base tunnel in the Susa valley, its length was increased from 52 to 57 km (35 mi). This will make it, when it opens, one of the longest rail tunnels in the world, ranking with the Gotthard Base Tunnel (57.1 km) the Seikan Tunnel (54 km) and the Channel Tunnel (50 km).

The portals will be in Saint-Jean-de-Maurienne on the French side and Susa on the Italian side.

The cost of the joint Franco-Italian section (from Saint Jean de Maurienne to Val Susa) is estimated at 9.975 billion euros (in January 2010 value). The cost will be borne by the French and Italian governments, and from EU funds.[5]

The tunnel will be used by freight trains and freight shuttles running at 100 km/h and by higher speed passenger trains operating at 220 km/h.

See also[edit]


  1. ^ Reina, Peter (16 June 2016). "After Earning World Record, Alpine Tunnels Move Ahead". Engineering News-Record. Retrieved 2016-06-20.
  2. ^ "Boring contract". Railway Gazette International. 2005-03-01.
  3. ^ "Decouvrez la maddalena". Lyon Turin Ferroviaire. 2016-04-10.
  4. ^ "Manuel Valls inaugure le tunnelier Federica au chantier du Lyon-Turin à Saint-Martin-La-Porte". LTF. Retrieved August 1, 2016.
  5. ^ "Brenner base tunnel wins TEN-T funding". Railway Gazette International. 2008-01-11. Archived from the original on 2012-05-31.

External links[edit]

Coordinates: 45°11′27″N 6°46′53″E / 45.190748°N 6.781311°E / 45.190748; 6.781311