City Line is a double-track railway with two new stations that is to be built in an approximately six kilometre-long tunnel between the commuter station Stockholm south and Tomteboda. The City Line is being constructed in order to solve the capacity problem for rail traffic through Stockholm. The City Line will be used by the commuter train services. Other services will continue to run on the existing two tracks via Stockholm Central Station.

A long-term solution to the congestion problem

The southern approach to Stockholm Central Station, which carries approximately 500 trains each day, is one of the worst bottlenecks in the Swedish railway network. It has only two tracks - the same number as when the line was opened in 1871. During peak traffic, commuter services and regional trains compete for space on the tracks with goods traffic and long-distance trains. There is a considerable risk of operational disruptions spreading to affect the entire railway network, since trains from the whole of Sweden converge on Stockholm Central Station.

The City Line will double the capacity of train services through central Stockholm. This improvement will benefit rail traffic both locally and regionally as well throughout the entire country. More commuter trains will be able to operate through Stockholm even during peak hour traffic periods, and punctuality will be improved. There will also be sufficent capacity to handle the increase in traffic that will result from other planned track extensions in the Mälar Region. Long-distance and goods traffic through Stockholm may also be developed as the rail network is gradually extended in Southern and  Central Sweden.

New commuter train stations in the Inner City area

The two new City Line stations, City and Odenplan, will be importent junctions that provide passengers using the Stockholm public transport system with new travel options. The new stations will reduce travel time for many passengers, either by bringing them closer to their destinations or by making it easier for them to change to the underground or bus services.

The total cost of the City Line is approximately SEK 16 billion.
The line is planned to become operational in 2017.

The City Line