This is the third of six EPC contracts for the Follo Line project, Norway's largest infrastructure project, and encompasses the section from the southern portal of the 20km Follo tunnel in the north to the south of Ski. It also includes the supply of railway systems.

Under the contract, which is worth NKr 2.5bn ($US 306.3m), Obrascón is responsible for interfacing with the TBM contractor for the new 20km Follo Line tunnel, where the twin-bore tunnel reaches an open section. From here the double track line will continue with a realignment and upgrade of the existing Østfold Line, which includes the installation of a six-track section and east and west connecting tracks, as well as construction of access roads, emergency locations, noise barriers and tunnel portals.

At Ski, the existing station will undergo a complete reconstruction. The station will have six new tracks, three island platforms and a new underpass. A new road bridge, bus terminal, bicycle parking facility, an enlarged car park, walkways and travels will also be built along with new buildings and a kickback siding south of the station for reversing trains.

Jernbaneverket says five companies prequalified for the tender and the decision to nominate Obrascón is based on an economic and project performance comparison. According to Norwegian public procurement legislation, the contract will be signed after the mandatory complaints period has expired, which is at the beginning of August, with work set to commence immediately after.