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Loetschberg base tunnel, General Contractor

Rhomberg Bahntechnik as Overall Contractor (OC) in a consortium (ARGE Bahntechnik Loetschberg), executed the contract for the technical railway equipment of the Loetschberg base tunnel of BLS – AlpTransit, Berne.

Lötschberg Basistunnel

Loetschberg base tunnel, General Contractor


BLS Alp Transit AG
Location: Switzerland
Project time: 04/2004 - 06/2007
Executing companies:: Rhomberg Bahntechnik (consortium with Implenia AG)
Contract value (net): 550 Mio. € (percentage of consortium 50%)


The Loetschberg Base Line runs from Frutigen to Raron. It comprises, in the north, the connection to the BLS Line and
the Frutigen bypass with the Engstligen tunnel, the Loetschberg base tunnel as well as, in the south, the Rhone crossing and the connection to the SBB (Swiss Federal Railway) line.

The centrepiece is the 34.6 km long Loetschberg base tunnel, consisting of two single­track tunnel tubes about 40 m apart
and connected to 333 m of transverse galleries.The tunnel work was completely executed in only 42 months,from the start of pre­assembly in Berne to project completion.


  • General contractor
  • Labelling
  • Temporary construction site facilities
  • Control technology
  • Logistics
  • Earthing
  • Safety
  • Communications technology (fixed landline telephones and wireless systems)
  • Slab Track
  • Sicherungsanlagen
  • Ballasted track
  • Safety installations
  • Electricity supply 50 Hz
  • Ventilation plants
  • Traction power supply 16.7 Hz
  • Cabinets
  • Catenary
  • Doors and gates
  • Cable Laying
  • Tunnel control system
  • Hand rails



  • Track length: total 57 km, 51 km in tunnel
  • Slab track system: LVT / Sonneville
  • Rail reference points: 171.000 blocks of type LVT (distance 60 cm)
  • Rails: UIC 60: 7.000 tons
  • HGV­switches: 2 in slab track, 1 ballasted track
  • Catenary: 2 x 60 km, high: 5,3 m up to 5,85 m adjustable
  • Max. speed: 250 km/h (in tunnel)