Editing Stockholm (section)

==== The City Line Project ====
{{Main|Stockholm City Line}}
With an estimated cost of SEK&nbsp;16.8&nbsp;billion (January 2007 price level), which equals 2.44&nbsp;billion US dollars, the [[Stockholm City Line|City Line]], an environmentally certified project, comprises a {{convert|6|km|abbr=on}}-long commuter train tunnel (in rock and water) beneath Stockholm, with two new stations (Stockholm City and Stockholm Odenplan), and a {{convert|1.4|km|abbr=on}}-long railway bridge at [[Enskede-Årsta|Årsta]]. The City Line was built by the Swedish Transport Administration in co-operation with the City of Stockholm, Stockholm County Council, and Stockholm Transport, SL. As [[Stockholm Central Station]] is overloaded, the purpose of this project was to double the city's track capacity and improve service efficiency. Operations began in July 2017.<ref name="trafikverket1">{{Cite web |title=The Stockholm City Line |url=http://www.trafikverket.se/en/startpage/projects/Railway-construction-projects/The-Stockholm-City-Line/ |access-date=28 July 2017 |publisher=[[Swedish Transport Administration]]  |archive-date=30 July 2017 |archive-url=https://web.archive.org/web/20170730015258/http://www.trafikverket.se/en/startpage/projects/Railway-construction-projects/The-Stockholm-City-Line |url-status=live }}</ref><ref>{{Cite magazine |last=Barrow |first=Keith |date=10 July 2017 |title=Stockholm City Line opens |url=http://www.railjournal.com/index.php/commuter-rail/stockholm-city-line-opens.html |magazine=[[International Railway Journal]] |access-date=28 July 2017 |archive-date=28 July 2017 |archive-url=https://web.archive.org/web/20170728213510/http://www.railjournal.com/index.php/commuter-rail/stockholm-city-line-opens.html |url-status=live }}</ref>

Between [[Riddarholmen]] and Söder Mälarstrand, the City Line runs through a submerged concrete tunnel.<ref name="trafikverket1" /> As a green project, the City Line includes the purification of waste water; noise reduction through sound-attenuating tracks; the use of synthetic diesel, which provides users with clean air; and the recycling of excavated rocks.<ref name="trafikverket1" />