SIGNALLING & TELECOMMUNICATIONSSUPPLEMENT 15
Solving Stockholm’s bottleneck problem
When completed in 2017, the new City Line will double the capacity of rail travel into the centre of Stockholm – ensuring the long-term development of rail travel and for creating an attractive and efficient public transport system that meets the demands and requirements of the city.
Complex tunnelling The City Line tunnels will measure between 25m2
for single tracks, 110m2 tracks and 220m2 for double- for stations. A total
of 4 million tonnes of blasted rock and 150,000 tonnes of soil will be excavated. The only section of the tunnel to be built differently will be the underwater section to the south of the city, where the tunnel will be floated into position as an immersed tube. Building a new rail tunnel in a city centre between 10 and 40 metres below the surface is a very complex and high-risk undertaking. When the City Line is finished in 2017,
A total of 4 million tonnes of blasted rock and 150,000 tonnes of soil will be excavated to make way for the City Line
Three million people live and work in Stockholm and the surrounding region. It is a market place for trade with goods and services and a centre for culture and entertainment. Many people commute into work from the suburbs and the investments made in the railways around Lake Malar have served to make rail travel an attractive alternative to travelling by car. The City Line is a €1.85 billion project to
build two railway lines beneath the city – a vital project for the long-term development of rail travel and for creating an attractive and efficient public transport system that meets the demands and requirements of the city. As Stockholm is built on many islands,
transport links to and from the centre can be difficult. At present, there are only two railway tracks running through central Stockholm. As a result, commuter trains, regional trains, long-distance trains and freight trains have to
use the same tracks, causing bottlenecks during peak time periods.
Commuter central A quarter of a million commuters travel by train every day in Sweden and eight out of every ten train journeys either begin or end in Stockholm. This puts enormous pressure on the transport system, with crowded trains and late-running trains. Once completed, the City Line will
dramatically improve travel into and out of the city centre. The two new commuter train stations, Odenplan and City, will make it easier to change between commuter trains, under - ground and bus services, which will help to cut travel times. The City Line’s two new tracks will serve to double the capacity for rail traffic from the current 24 trains per hour in each direction to 48.
commuter trains will run on their own tracks in a 6km-long tunnel. Other rail services will con - tinue to operate on the present tracks. This means that track capacity will be doubled and trains will be able to run more frequently and punctually. Interchanges will be smoother because the new stations are located close to bus routes and metro lines.
Eskil Sellgren is the Deputy Managing Director for WSP Sweden, mainly responsible for the WSP Civils with 800 staff. Mr. Sellgren has a long and sound experience as a head and leader in diff erent types of roles and has an MSc in Civil Engineering and PhD in Soil Mechanics.
WSP Sverige AB Arenavägen 7
SE-121 88 Stockholm-Globen Tel: +46 (0) 8 688 61 87 Fax: +46 (0)8 688 69 18
European Railway Review Volume 18, Issue 1, 2012
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