WSP and the City Line
It will enable more traffic to be routed through the narrow approach to the city centre, easing congestion and increasing capacity by providing local commuter trains with their own dedicated section of track through the city.
It will also have two central underground stations to relieve city centre rail traffic. This will double capacity through the city from the current 24 trains per hour in each direction to 48. City Line is for commuter trains – existing lines will be kept for inter-city and goods trains.
The Swedish Rail Administration has appointed WSP to project manage the track, water and waste water installations for the entire length of the tunnel. WSP will also undertake rock investigation, geotechnical and construction work for the northern half of the project.
The City Line is a very complex and high-risk undertaking
Building a new rail tunnel in a city centre between 10 and 40 m below the surface is a very complex and high-risk undertaking. In fact, the project’s geotechnical models are the most complex ever run in Sweden. The new tunnel intersects the existing subway in two locations, so blasting necessitates the relocation of the subway track. WSP’s activities include the preparation of a new prefabricated bridge concept to carry traffic during the construction period.
The new tunnel has several interchanges with services tunnels carrying traffic control, power supply, water, waste water, telecom and energy lines. Access tunnels will also be required for the removal of building materials and blast rubble.
More information
WSP appointed to major role on prestigious Stockholm City Line project and the web site www.citybanan.se
See also the Värta Harbour project
New pier for ferry traffic at Värta Harbour
To create the structure of the pier needs 1,500,000 m3 of rock, blasted from the simultaneous construction of Stockholm’s Northern link and City Line. The rock will be conveyed to a temporary site at Husar Bay, to be crushed and then shipped on barges to the Värta pier.