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The Circle Line (CCL) is Singapore's fourth Mass Rapid Transit line. This underground line is long with 30 stations (excluding Bukit Brown) and is fully automatically operated.〔(【引用サイトリンク】 title=ALSTOM chosen for the world’s longest fully automated metro line in Singapore )〕 It takes about one hour to travel from one end to the other. The line is coloured yellow in the rail map. As the name implies, the line is an orbital circle route linking all radial routes leading to the city. It also covers many parts of the Central Area. From Promenade, the line branches with one branch terminating at Dhoby Ghaut and the other terminating at Marina Bay. Transfers to the North South Line are provided at Bishan, Dhoby Ghaut and Marina Bay, East West Line at Paya Lebar and Buona Vista, and North East Line at Dhoby Ghaut, Serangoon and HarbourFront. The Downtown Line interchanges with the Circle Line at Bayfront and Promenade and future sections of the Downtown Line will interchange at Botanic Gardens and MacPherson. The future Thomson-East Coast Line will interchange with the Circle Line at Caldecott and Marina Bay. The Circle Line is the first medium capacity line in Singapore. As a medium capacity line, each Circle Line train has only three cars instead of the six-car configuration as seen on other currently operating MRT lines. Half a million people were expected to use the Circle Line each day. The line reduces travelling time for commuters by allowing them to shorten trips between north to east or north to west and vice versa, bypassing busy interchange like City Hall and Raffles Place. On 8 October 2011, the Circle Line became fully operational to commemorate its operator SMRT's 24th Anniversary for Rail Services since the company's establishment in 1987. ==History== Plans for the Circle Line date back to the 1980s. The then Minister for Communications and Information, Dr Yeo Ning Hong stated that such a system "would be feasible when the population reaches four million." The Circle Line was first known as the Marina Line in May 1998. The Marina Line was initially planned as a 12-station underground line, starting from Chinatown and Dhoby Ghaut via the National Stadium to either Kallang or Paya Lebar station. However, the Chinatown leg was later truncated and was reduced to 6 stations up to Stadium station. On the other hand, a further extension towards Upper Paya Lebar was added in the year 2000. The Marina Line was also merged with a LRT line that goes from Paya Lebar to Buona Vista via Serangoon and Bishan to form Circle Line Stage 3 and 4 in 2001. Stations in Circle Line that were a part of the original Marina Line plans include Dhoby Ghaut, Bras Basah, Esplanade, Promenade, Nicoll Highway and Stadium. Also, the part of the Marina Line from Chinatown to Promenade is now part of the Downtown Line. Construction started in 2002, and was supposed to be opened from 2006 and fully opened in 2010, with an estimated cost of S$6.7 billion, the Nicoll Highway collapse caused the construction of the Circle Line to be delayed to open from 28 May 2009 (the Stage 3 of which it is not affected by Nicoll Highway collapse), with full opening on 8 October 2011, at an escalated cost of nearly S$10 billion.〔(Circle Line could cost taxpayers $10 billion )〕 Due to the re-alignment of the Nicoll Highway Station to a new location, the station is only two-thirds the size of the original plan before the collapse, and located away from the highway collapse site.〔("Circle Line will exceed $6.7b budget" ) Christopher Tan, The Straits Times, 15 September 2007〕 The decision was also made to open both Caldecott, and Haw Par Villa stations (previously Thomson and West Coast), as a normal stations leaving the Bukit Brown MRT Station closed, and there is only a middle track and emergency escape shaft. Stage 3, a five-station segment stretching from Bartley to Marymount, was the first section of the line opened, on May 28, 2009. Initial ridership on this section was lower than estimated, at 32,000 passengers per day (ppd) instead of the estimated 55,000 ppd.〔(LTA completes final tunnelling work on Circle Line – Channel NewsAsia )〕 Tunneling works for the entire line were completed on August 17, 2009.〔(Breaking News | The Straits Times )〕 Stages 1 and 2 started operations on April 17, 2010,〔http://app.lta.gov.sg/corp_press_content.asp?start=kpt8zx9w8ik53wi33gr59p754348fsj35b9glldouy8ndlh7kb〕 Stages 4 and 5 on October 8, 2011,〔(Train crowding to ease with launch of full Circle Line: Minister Lui | SingaporeScene – Yahoo! News Singapore )〕 and the final Circle Line Extension on January 14, 2012. The line was also fully completed in October 2011, to commemorate operator SMRT's 24th anniversary. On 17 January 2013, the Land Transport Authority (LTA) announced 'Circle Line Stage 6' which will close the circle, running between Marina Bay and HarbourFront via Keppel Port, Cantonment and Marina Coastal stations, closing the final stage of the Tanjong Pagar central business district. It will be a 4 km extension.〔(CIRCLE LINE STAGE 6 )〕 On 29 October 2015, the LTA announced the 3 station locations for the 'Circle Line Stage 6'. The stations are Keppel Station, Cantonment Station and Prince Edward Station. Tenders will be called for construction in 2016 and demolition, diversion and utility works will commence in 2017. Construction of the line will begin in earnest in 2018 and it is due for completion in 2025. 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「Circle MRT Line」の詳細全文を読む スポンサード リンク
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