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Kehärata (the Ring Rail Line, previously ''Marjarata'', (スウェーデン語:Ringbanan)) is a railway route in the area of the city of Vantaa, in the Greater Helsinki Metropolitan Area of Finland. It connects Helsinki-Vantaa Airport and the adjacent Aviapolis business and retail district to the Helsinki commuter rail network. The line fills a gap between the existing Vantaankoski railway station and Tikkurila railway stations, travelling in tunnels underneath the airport. The line started operating on 1 July 2015. == History == 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.〔 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.〔(【引用サイトリンク】 url = http://www.keharata.fi/ )〕 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. The Ring Rail Line started operating on 1 July 2015. The station at the Helsinki Airport opened later, with the Tietotie entrance opening on 10 July and the direct connection to the terminal opening later in the Autumn. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ring Rail Line」の詳細全文を読む スポンサード リンク
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