All the trains that pass through Stockholm, including commuter, regional and intercity trains, currently has to pass through a bottle neck with only two tracks south of the central station. This means that a large number of trains are operating on a short stretch of track. However, the existing congestion will soon be a thing of the past.
A six-kilometre-long tunnel for commuter trains running north-south through the city will be completed in 2017. At the same time, two new commuter stations – Station Stockholm Odenplan and Stockholm City – will be opened, which will have direct links to existing subway stations in the city centre. Caverion has supplied technical installations for both the new stations.
- "We have been installing the lighting, power and automation systems at Odenplan station since 2013. We expect to complete the work in March and then a trial period will begin. This will allow us to make sure that everything is functioning correctly before we hand over operation to the customer. The stations will be connected to the customer's own control system which will give the customer a complete overview of all the technical systems and installations," explains Kåre Persson, one of Caverions project leaders.
Caverion also designed and constructed a solution to ensure that the stations can continue functioning in an emergency. A high-voltage backup power plant just outside the city centre will keep the technical systems at both stations in operation even in the event of a long-term power cut.
- "We worked with the customer on a large number of different scenarios which could occur if there was a power cut. The solution we chose was a high-voltage power plant with a tank which will hold 20 cubic metres of diesel. This can supply backup power to the two stations in five different ways in the event of an emergency. Provided that the system is refilled with diesel, the power plant can continue operating for weeks," says Kåre Persson.
A new commuter station has been built at Stockholm's busiest transport hub
A new commuter station with direct links to the metro system has also been built at Stockholm's busiest transport hub, the central station. It currently takes passengers around ten minutes to get from the metro system to a commuter train, but the improved connections in the new station will reduce this to just a couple of minutes. Caverion has installed sprinklers, heating and sanitation at Stockholm City station.
Both Station Stockholm Odenplan and Stockholm City stations have been built underneath the existing metro system tunnels, which means that they are deep below the ground. As a result, careful planning and complex logistics systems were needed.
- "Some of the challenges included long transport routes and problems in moving materials to the right place. Together with the difficulty of keeping a clear perspective on the work, this meant that we sometimes had to come up with highly innovative solutions. Throughout the project we worked very closely with the customer to identify and resolve potential problems before they occurred," explains Kåre Persson.