Loetschberg base tunnel, General Contractor

Loetschberg base tunnel, General Contractor

Rhomberg Bahntechnik served as the overall contractor (OC) in a consortium (ARGE Bahntechnik Loetschberg), and executed the contract for Loetschberg base tunnel’s technical railway equipment (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%)


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

The centrepiece is the 34.6km long Loetschberg base tunnel, consisting of two singletrack tunnel tubes which are about 40m apart and connected to 333m of transverse galleries. The tunnel work was carried out in just 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
  • Safety installations
  • Ballasted track
  • Ventilation plants
  • Electricity supply 50 Hz
  • Cabinets
  • Traction power supply 16.7 Hz
  • Doors and gates
  • Catenary
  • Tunnel control system
  • Cable Laying
  • Hand rails



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