The NOK1.145bn (US$130m) contract covers tunnelling and ground construction work on the section of the rail line.
The new 8.2km Fornebu Line will connect the centre of Fornebu peninsula to the Norwegian capital at Majorstuen. It will have six stations: Skøyen, Vækerø, Lysaker, Telenor Arena, Flytårnet and Fornebu Senter.
Recent increases in cost forecasts for the project mean that, while the Lysaker to Vækerø tunnel contract has been awarded, it will be signed at a later date.
Oslo City Government says the project is complex and extensive with large rock caverns, long tunnels, deep construction pits, shafts, structures and comprehensive technical installations. The line passes through challenging geology with folding structures, faults, deep gouges, clay soils and with low rock cover.
Cowi, in joint venture with Multiconsult, is designing the line, which is Oslo’s largest transport project in over 20 years.
In March last year, Implenia was chosen to build the 2.3km-long Lysaker-Fornebu tunnel on the line.
