Present State
The founding stone of the line was laid on 3 March 2009, and construction was started on 13 May 2009 with the excavation of service tunnels. The excavation of a 300 m long tunnel station under the airport was completed in March 2010, as the construction was proceeding on schedule. The line is to open in mid-2015, a year later than initially planned.
In February 2011, a video on the project's official website stated that the project would be open by June 2014. It announced various new details, including that the station at Tikkurila would be entirely rebuilt as an integrated travel centre, as well as details on the trains that would serve the airport. In September 2012, the opening date was pushed back to July 2015, due to the unexpected need to re-design and reinforce the airport station tunnel to withstand the acidic products of glycol decay by bacteria within the ground. The ground and bedrock at the airport are contaminated by decades of glycol use as an aircraft de-icing agent.
Read more about this topic: Ring Rail Line
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