:Botanic Gardens MRT station

The station was first announced in December 2003 as Adam station as part of Stages 4 and 5 of the Circle Line (CCL).{{cite news |first=Joy|last=Frances|title=Completing the Circle via Holland V |url=https://eresources.nlb.gov.sg/newspapers/Digitised/Article/today20031213-1.2.3 |work=Today |date=13 December 2003 |page=1 }}{{cbignore}}{{Cite web |date=16 November 2005 |title=Stages 4 & 5 of Circle Line |url=http://www.lta.gov.sg/projects/proj_rail_ccl4n5.htm |url-status=dead |archive-url=https://web.archive.org/web/20040616041703/http://www.lta.gov.sg/projects/proj_rail_ccl4n5.htm |archive-date=16 June 2004 |access-date=21 September 2020 |publisher=Land Transport Authority}} The contract for the construction of the Adam and Farrer stations (including {{convert|6.3|km|miles}} of twin bored tunnels) was awarded to Taisei Corporation for {{SGDConvert|391.588|m|year=2004|showdate=no|r=1}} in July 2004.{{Cite web|title=Award Of Contract For Construction And Completion Of Adam And Farrer Stations|url=http://app.lta.gov.sg/corp_press_content.asp?start=1052|last=|first=|date=1 July 2004| publisher=Land Transport Authority|url-status=dead|archive-url=https://web.archive.org/web/20120906042031/http://app.lta.gov.sg/corp_press_content.asp?start=1052|archive-date=6 September 2012|access-date=6 September 2022}}

The Land Transport Authority (LTA) launched a public poll in 2005 to replace the station's working name "Adam". While "Cluny" garnered more votes at 46.5% over "Old University", "Botanic Gardens" was chosen in November as the station name due to it being a popular suggestion from the respondents.{{Cite web|title=Station Names For Circle Line Stages 4 And 5|url=http://app.lta.gov.sg/apps/news/page.aspx?c=2&id=1419|last=|first=|date=7 November 2005|publisher=Land Transport Authority|url-status=dead|archive-url=https://archive.today/20210307033923/https://eresources.nlb.gov.sg/webarchives/2010-04-23%2022:03:36.000/wp/details/http://app.lta.gov.sg/corp_press_content.asp?start=1419|archive-date=7 March 2021|access-date=2 February 2024|via=Web Archive Singapore}} As announced by transport minister Lui Tuck Yew during his visit to the Stages 4 and 5 CCL stations on 1 August 2011,{{Cite web |url=http://www.mot.gov.sg/news-centre/highlights/detail/circle-line-from-marymount-to-harbourfront-to-open |date=1 August 2011 |title=Circle Line from Marymount to HarbourFront to open |publisher=Ministry of Transport |language=en |access-date=28 April 2020 |archive-date=19 November 2020 |archive-url=https://web.archive.org/web/20201119125715/https://www.mot.gov.sg/news-centre/highlights/detail/circle-line-from-marymount-to-harbourfront-to-open |url-status=live}}{{cite web |title=12 Circle Line Stations, from Marymount to HarbourFront, to Open on 8 October – Press Room – Land Transport Authority|publisher=Land Transport Authority |date=1 August 2011 |url=https://www.lta.gov.sg/apps/news/page.aspx?c=2&id=pharbnd879bjz9ota7rrl6r7150ytjs8g7wf2n00qbcz29b005 |archive-url=https://web.archive.org/web/20171017151218/https://www.lta.gov.sg/apps/news/page.aspx?c=2&id=pharbnd879bjz9ota7rrl6r7150ytjs8g7wf2n00qbcz29b005 |archive-date=17 October 2017 |url-status=dead |access-date=10 February 2022}} the station began revenue service on 8 October of that year.{{Cite web |title=Speech by Mr Tharman Shanmugaratnam at the Circle Line Opening Ceremony on 7 Oct 2011 |date=7 October 2011 |url=http://www.mot.gov.sg/news-centre/news/Detail/Speech%20by%20Mr%20Tharman%20Shanmugaratnam%20at%20the%20Circle%20Line%20Opening%20Ceremony%20on%207%20Oct%202011/ |publisher=Ministry of Transport |language=en |access-date=1 May 2020 |archive-date=1 May 2020 |archive-url=https://web.archive.org/web/20200501111937/https://www.mot.gov.sg/news-centre/news/Detail/Speech%20by%20Mr%20Tharman%20Shanmugaratnam%20at%20the%20Circle%20Line%20Opening%20Ceremony%20on%207%20Oct%202011/ |url-status=dead}}{{cite web |last1=Almenoar |first1=Maria |title=Circle Line opens on Saturday after 10-year wait |url=http://www.straitstimes.com/BreakingNews/Singapore/Story/STIStory_721203.html |website=The Straits Times |publisher=Singapore Press Holdings |access-date=9 February 2022 |archive-url=https://web.archive.org/web/20120625100627/http://www.straitstimes.com/BreakingNews/Singapore/Story/STIStory_721203.html |archive-date=25 June 2012 |date=8 October 2011 |url-status=dead}} An opening ceremony to commemorate the opening of Stages 4 and 5 of the CCL was held at this station, with deputy prime minister Tharman Shanmugaratnam in attendance.{{cite web | title=Govt to cut rail overcrowding, journey times | first=Hetty Musfirah Abdul |last=Khamid | website=Channel NewsAsia | date=7 October 2011 | url=http://www.channelnewsasia.com/stories/singaporelocalnews/view/1157927/1/.html | archive-url=https://web.archive.org/web/20111008025240/http://www.channelnewsasia.com/stories/singaporelocalnews/view/1157927/1/.html | archive-date=8 October 2011 | url-status=dead | access-date=31 January 2025}}

File:DT9 Botanic Gardens MRT Platform A 20201011 163004.jpg

Botanic Gardens was first announced to be an interchange station with the Downtown Line (DTL) in 2007,{{Cite news |date=15 March 2007 |title=Five stops planned for first phase of Downtown MRT line |page=1 |work=The Straits Times |publisher=Singapore Press Holdings |first1=Christopher |last1=Tan |url=https://www.straitstimes.com/multimedia/graphics/assets/images/ST175/NewspaperSG/2007-03-15/full.jpg |access-date=8 November 2022 |archive-date=8 November 2022 |archive-url=https://web.archive.org/web/20221108084438/https://www.straitstimes.com/multimedia/graphics/assets/images/ST175/NewspaperSG/2007-03-15/full.jpg |url-status=live}} and the LTA announced on 15 July 2008 that it would be part of DTL Stage 2 (DTL2).{{cite web|url=http://app.lta.gov.sg/corp_press_content.asp?start=1969|title=Downtown Line 2 Station Sites Named|publisher=Land Transport Authority|access-date=17 June 2009|url-status=dead| archive-url=https://web.archive.org/web/20110527042907/http://app.lta.gov.sg/corp_press_content.asp?start=1969|archive-date=27 May 2011}} The contract for the design and construction of Botanic Gardens station and associated tunnels was awarded to Sembawang Engineers and Constructors Pte Ltd for {{SGDConvert|378.2|m|year=2009|showdate=no}} in July 2009. The contract also includes the construction of the adjacent Stevens station. Construction of the station was scheduled to commence in the third quarter of 2009 and targeted to complete by 2015.{{cite web |title=Award of Contract 919 – Stations and Tunnels at Botanic Gardens and Stevens {{!}} Press Room {{!}} Land Transport Authority |url=http://www.lta.gov.sg/apps/news/page.aspx?c=2&id=2153 |publisher=Land Transport Authority |archive-url=https://archive.today/20210307034037/https://eresources.nlb.gov.sg/webarchives/2016-04-25%2019:08:57.000/wp/details/http://www.lta.gov.sg/apps/news/page.aspx?c=2&id=2153 |archive-date=7 March 2021 |date=1 July 2009 |url-status=dead|via=Web Archive Singapore}}

On 11 March 2012, a worker died when a concrete slab fell on him. Rescuers had to use a breaking tool to break the concrete slab and recover his body.{{cite web |url=http://www.asiaone.com/News/Latest%2BNews/Singapore/Story/A1Story20120311-332783.html |title=Bangladeshi worker killed after concrete slab falls on him |work=AsiaOne |first=Paul |last=Lim |date=11 March 2012 |access-date=18 April 2012 |archive-url=https://web.archive.org/web/20120419092404/http://www.asiaone.com/News/Latest+News/Singapore/Story/A1Story20120311-332783.html |archive-date=19 April 2012 |url-status=dead }} The station opened on 27 December 2015 along with the other DTL2 stations.{{cite web|url=http://www.straitstimes.com/news/singapore/more-singapore-stories/story/thumbs-downtown-lines-earlier-opening-20141003|title=Thumbs Up For Downtown Line's Earlier Opening|website=The Straits Times|date=3 October 2014|access-date=28 February 2015|archive-url=https://web.archive.org/web/20150403023227/http://www.straitstimes.com/news/singapore/more-singapore-stories/story/thumbs-downtown-lines-earlier-opening-20141003|archive-date=3 April 2015|url-status=live}}{{Cite web|url=https://www.lta.gov.sg/content/ltagov/en/newsroom/2015/11/2/downtown-line-2-is-coming-to-townthis-december.html|title=LTA {{!}} News Room {{!}} News Releases {{!}} Downtown Line 2 is Coming to Town….this December| publisher=Land Transport Authority|access-date=24 April 2020|archive-date=4 September 2020|archive-url=https://web.archive.org/web/20200904124826/https://www.lta.gov.sg/content/ltagov/en/newsroom/2015/11/2/downtown-line-2-is-coming-to-townthis-december.html|url-status=live}}

On 4 May 2017, a faulty Platform Screen Door (PSD) on the Downtown Line (DTL) platform caused delays for trains heading to Chinatown station as the staff had to manually operate the doors. At 9:37 am, the Chinatown-bound platform was temporarily closed to allow DTL train services to proceed without further delays. The fault was resolved by 12:54 pm, and Chinatown-bound services resumed at Botanic Gardens station.{{cite web |last=Toh |first=Wen Li |last2=Kua |first2=Chee Siong |date=3 May 2017 |title=Downtown Line service resumes after delay caused by faulty platform doors at Botanic Gardens |url=https://www.straitstimes.com/singapore/transport/delay-on-entire-downtown-line-towards-chinatown-due-to-signalling-fault |access-date=21 January 2025 |website=The Straits Times}} An investigation determined that groundwater seepage had damaged the PSD's electrical components, causing the fault. The seepage issue was resolved by grouting with a polyurethane chemical to fill the void and prevent further leaks.{{cite web |date=3 May 2017 |title=Update: Platform Screen Door malfunctioned at Botanic Gardens Station on the Downtown Line |url=https://www.sbstransit.com.sg/news/update-platform-screen-door-malfunctioned-at-botanic-gardens-station-on-the-downtown-line |access-date=21 January 2025 |website=SBSTransit}}{{cite web |date=18 May 2017 |title=Water leakage caused Botanic Gardens door glitch on May 3: SBS Transit |url=https://www.straitstimes.com/singapore/transport/water-leakage-caused-botanic-gardens-door-glitch-sbs-transit |access-date=21 January 2025 |website=The Straits Times}}

Botanic Gardens station is an interchange station on the CCL and the DTL. On the CCL, the station is between the {{MRT station|Caldecott}} and {{MRT station|Farrer Road}} stations, while the station is between the {{MRT station|Tan Kah Kee}} and {{MRT station|Stevens}} stations on the DTL. The station code is CC19/DT9.{{cite web |title=MRT System Map |url=https://www.lta.gov.sg/content/dam/ltagov/getting_around/public_transport/rail_network/pdf/tel3_sm-en.pdf |publisher=Land Transport Authority |access-date=14 December 2022 |archive-date=15 November 2022 |archive-url=https://web.archive.org/web/20221115113715/https://www.lta.gov.sg/content/dam/ltagov/getting_around/public_transport/rail_network/pdf/tel3_sm-en.pdf |url-status=live }}{{cite web |title=System Map |url=https://www.transitlink.com.sg/eservice/eguide/mrt_sys_map.htm |publisher=TransitLink |access-date=11 November 2022 |archive-date=10 November 2022 |archive-url=https://web.archive.org/web/20221110094219/https://www.transitlink.com.sg/eservice/eguide/mrt_sys_map.htm |url-status=live }} The station is located near the Singapore Botanic Gardens along Bukit Timah Road; its two entrances serve Adam Road Food Centre, Cluny Court, the French Embassy, the National University of Singapore (NUS) Faculty of Law, Crown Centre, Serene Centre and Singapore Bible College.{{cite web | title=Train Service Information | website=SBSTransit | url=https://www.sbstransit.com.sg/Service/TrainInformation?TrainLine=DTL&Station=BTN | access-date=30 January 2024 | archive-date=30 January 2024 | archive-url=https://web.archive.org/web/20240130022704/https://www.sbstransit.com.sg/Service/TrainInformation?TrainLine=DTL&Station=BTN | url-status=live }}{{cite web | title=Botanic Gardens – Exits | website=SMRT Journeys | publisher=SMRT Corporation | url=http://journey.smrt.com.sg/journey/station_info/botanic-gardens/exits/ | access-date=30 January 2024 | archive-date=30 January 2024 | archive-url=https://archive.today/20240130051308/http://journey.smrt.com.sg/journey/station_info/botanic-gardens/exits/ | url-status=live }} Botanic Gardens is one of two stations on the MRT network to have a distinct Malay name.{{cite web |title=System Map (Peta Sistem) |url=https://www.lta.gov.sg/content/dam/ltagov/getting_around/public_transport/rail_network/pdf/sm_tel3_ml2.pdf |publisher=Land Transport Authority |access-date=2 February 2024 |archive-date=26 November 2023 |archive-url=https://web.archive.org/web/20231126075034/https://www.lta.gov.sg/content/dam/ltagov/getting_around/public_transport/rail_network/pdf/sm_tel3_ml2.pdf |url-status=live }}

The station is wheelchair-accessible. A tactile system, consisting of tiles with rounded or elongated raised studs, guides visually impaired commuters through the station,{{Cite web |date=30 July 2021 |title=Tactile Guiding System: Studs and Strips to Guide Your Way |url=https://www.lta.gov.sg/content/ltagov/en/who_we_are/statistics_and_publications/Connect/tactile-guiding-system.html |access-date=11 September 2021 |publisher=Land Transport Authority |archive-date=11 September 2021 |archive-url=https://web.archive.org/web/20210911021750/https://www.lta.gov.sg/content/ltagov/en/who_we_are/statistics_and_publications/Connect/tactile-guiding-system.html |url-status=live}} with dedicated tactile routes that connect the station entrances to the platforms.{{sfn|Cheong|2012|p=149}} Wider fare gates allow easier access for wheelchair users into the station.{{sfn|Cheong|2012|p=149}}{{sfn |Feng |2017 |p=100}} Botanic Gardens CCL station is one of eleven stations along the CCL designated as Civil Defence shelters,{{cite web |title=List of Public CD shelters as of 31 Dec 2019 |url=https://www.scdf.gov.sg/docs/default-source/scdf-library/fssd-downloads/list-of-public-cd-shelters-as-of-31-dec-2019.pdf |publisher=Singapore Civil Defence Force |access-date=3 September 2021 |archive-date=3 September 2021 |archive-url=https://web.archive.org/web/20210903080538/https://www.scdf.gov.sg/docs/default-source/scdf-library/fssd-downloads/list-of-public-cd-shelters-as-of-31-dec-2019.pdf |url-status=dead}} which are to be activated in times of national emergency. Apart from reinforced construction, the stations are designed and equipped with facilities to ensure the shelter environment is tolerable for all during shelter occupation. These facilities include protective blast doors, decontamination facilities, ventilation systems, power and water supply systems and a dry toilet system.{{sfn | Cheong | 2012 | p=176}}

The CCL station has a water feature at one end of the platform,{{sfn | Cheong | 2012 | p=178}} with cascading water illuminated by red, green and blue lights. The water is collected in a trough which prevents water from getting into the station. This feature was a later inclusion of the station design intended as a landmark for welcoming commuters to the gardens.{{sfn | Zhuang | 2013 | p=119}} The interior of the DTL station incorporates touches of nature with green palettes that reflect the design concept of flora and fauna.{{cite web | title=Downtown Line | website=LTA | date=21 October 2017 | url=https://www.lta.gov.sg/content/ltagov/en/getting_around/public_transport/rail_network/downtown_line.html | access-date=30 January 2024 | archive-date=1 November 2019 | archive-url=https://web.archive.org/web/20191101093904/https://www.lta.gov.sg/content/ltagov/en/getting_around/public_transport/rail_network/downtown_line.html | url-status=live }}

The station displays two artworks that were commissioned as part of the MRT network's Art-in-Transit programme, a showcase of public artworks on the MRT network.

File:CC19 Botanic Gardens MRT platforms 20240203 131620.jpg

Aquatic Fauna No. 1, by Lam Hoi Lit and Chua Chye Teck, is a large mural of paper cuttings depicting varieties of animals and plants along a section of the CCL platform wall.{{cite web | title=Art in Transit | publisher=Land Transport Authority | date=9 November 2022 | url=https://www.lta.gov.sg/content/ltagov/en/getting_around/public_transport/a_better_public_transport_experience/art_in_public_transport/art_in_transit.html | access-date=13 November 2022 | archive-date=13 November 2022 | archive-url=https://web.archive.org/web/20221113102534/https://www.lta.gov.sg/content/ltagov/en/getting_around/public_transport/a_better_public_transport_experience/art_in_public_transport/art_in_transit.html | url-status=live }}{{sfn|Zhuang|2013|p=117}}{{cite web|title=Annex B: Summary of CCL Art-in-Transit Concepts|url=http://www.lta.gov.sg/images/News%20Release%20CCL%20AIT%20Annex%20B.pdf|publisher=Land Transport Authority|access-date=11 October 2011|archive-url=https://web.archive.org/web/20111027165128/http://www.lta.gov.sg/images/News%20Release%20CCL%20AIT%20Annex%20B.pdf|archive-date=27 October 2011|url-status=dead}} The work, referencing the station's proximity to Botanic Gardens, was intended to introduce nature to the station and complement the station's water feature as part of an overarching "underwater garden" theme.{{sfn|Zhuang|2013|pp=117, 118}} In light of Singapore's rapid urbanisation, the artists also wanted the work to bring attention to preservationist and conservation efforts.{{Cite web |title=Circle Line Art |url=https://www.lta.gov.sg/content/dam/ltaweb/corp/PublicTransport/files/CEL.pdf |url-status=dead |archive-url=https://web.archive.org/web/20170211184413/https://www.lta.gov.sg/content/dam/ltaweb/corp/PublicTransport/files/CEL.pdf |archive-date=11 February 2017 |access-date=20 September 2020 |publisher=Land Transport Authority}}

Aware of the Botanic Gardens' large role in Singapore's nature through its horticultural work and research, the artists, who had collaborated before, selected the Botanic Gardens station when they were commissioned to create an artwork for the CCL. When the pair had crafted Lam's previous work, Hybrid Fishes, they had obtained insights about aquatic life and plants, which inspired the Botanic Gardens station artwork's "underwater garden" theme.{{sfn|Zhuang|2013|p=117}} Using a technique similar to traditional Chinese paper-cutting, the artist produced various images in a short time and pieced together the paper cuts. The artists devised three large patterns, one of which the Art Review Panel selected as the motif for the final mural.{{sfn|Zhuang|2013|p=118}}

Chua photographed the chosen pattern, which was scanned and converted to a digital vector drawing. While digitalising their work, Lam and Chua smoothened the jagged edges of the paper cuts that ended up pixelated in the scans. In fusing the various elements, the artists also avoided repetitive-looking details in the final artwork. The work was then printed on a vinyl sticker which was cut into several pieces before being put up over the platform.{{sfn|Zhuang|2013|p=118}} Chua considered the project as a "celebration" of art form and nature, while Lam hoped commuters would be more environmentally aware to the natural environment of which they were part.{{sfn|Zhuang|2013|p=119}}

File:DT9 Botanic Gardens MRT Concourse 20240201 084616.jpg

File:Tembusu tree at Lawn E, Singapore Botanic Gardens 20240210 182325.jpg

What is a Tree? by Shirley Soh depicts the iconic Tembusu tree on the front lawn of Botanic Gardens through three art mediums – a photograph, a metal engraving and a sandblasted silhouette. Her first permanent public artwork,{{sfn | Zhuang | Soh | 2022 | p=52}} the piece is also accompanied by a series of quotes by poets, artists and nature lovers that are etched into the station's floor.{{cite web |title=Take a Walk in the Gardens of Life |url=https://www.lta.gov.sg/content/dam/ltagov/getting_around/public_transport/a_better_public_transport_experience/art_in_transit/pdf/DTL%20AIT%20QR%20DT9%20BTN.pdf |publisher=Land Transport Authority |access-date=30 January 2024 |archive-date=30 January 2024 |archive-url=https://web.archive.org/web/20240130091042/https://www.lta.gov.sg/content/dam/ltagov/getting_around/public_transport/a_better_public_transport_experience/art_in_transit/pdf/DTL%20AIT%20QR%20DT9%20BTN.pdf |url-status=live }} Soh selected the Tembusu tree to represent her artwork on trees for Botanic Gardens station, as it was the most iconic feature of Singapore after which many places and buildings were named. The artist was also inspired by the book The Secret Life of Trees by Colin Tudge, which encouraged people to look inside trees instead of just their exteriors, given the importance of trees.{{sfn | Zhuang | Soh | 2022 | p=48}}

Soh noted how different the tree appears from other perspectives, which inspired her to create three different art pieces. Soh also intended to draw the attention of commuters, making them feel familiarity with the artwork and having them consider whether it was the same as the Tembusu tree.{{sfn | Zhuang | Soh | 2022 | p=48}} The barren form which exposed the Tembusu's trunking system was initially planned to be crafted out of rusted Corten steel to resemble the original colour of the tree. Due to safety concerns, the station contractor suggested using copper, which was burnt and brushed to achieve the desired colour.{{sfn | Zhuang | Soh | 2022 | p=52}} The sandblasted silhouette depicts the ecosystem that the tree supports, including the insects in the trunk and the birds on the branches.{{sfn | Zhuang | Soh | 2022 | p=48}} The photograph displayed at the DTL platform is accompanied by seeds and leaves collected at the Tembusu, with the flowers extended in surrealist style. The photograph references the colonial-era botanical illustrations while illustrating the "whole life of a tree".{{sfn | Zhuang | Soh | 2022 | p=51}}

As many Singaporeans visit the Botanic Gardens, Soh sought public involvement by working with National Parks Board to gather thoughts about trees. The quotes that became part of the artwork also include local literature on trees, from Arthur Yap's poem Bayan Tree to Kuo Pao Kun's The Silly Young Girl and the Funny Old Tree. For the artwork, Dr Geh Mih – the Nature Society President – and the NUS students of Tembusu College provided their reflections on trees. A volunteer of the Gardens – Keith Hiller, with whom Soh formed a friendship during her visits to the Gardens – contributed two poems on the distinct nature of a tree. Soh took the idea to incorporate literature from her visits to train stations in India, where poetry was written on the walls of stations for waiting commuters to read.{{sfn | Zhuang | Soh | 2022 | p=51}}

{{Clear}}

{{Reflist|}}

• {{Cite book |last=Cheong |first=Colin |title=The Circle Line: Linking All Lines |publisher=Land Transport Authority |date=2012 |publication-place=Singapore |isbn=978-981-4342-02-5|url=https://www.lta.gov.sg/content/dam/ltagov/who_we_are/statistics_and_publications/books/pdf/Circle_Line_Book.pdf}}
• {{cite book | last=Feng | first=Zengkun | title=Downtown Line: Soaring to new heights | publisher=Straits Times Press Pte Ltd | publication-place=Singapore | year=2017 | isbn=978-981-4747-66-0 | oclc=1003852882|url=https://www.lta.gov.sg/content/dam/ltagov/who_we_are/statistics_and_publications/books/pdf/The_Downtown_Line_book.pdf}}
• {{Cite book |last=Zhuang |first=Justin |title=Art in Transit: Circle Line MRT |publisher=Land Transport Authority |year=2013 |isbn=978-981-07-4982-8 |publication-place=Singapore |oclc=854958677}}
• {{cite book | last1=Zhuang | first1=Justin | last2=Soh | first2=Darren | publisher= Land Transport Authority | title=Art in Transit: Downtown Line Singapore | publication-place=Singapore | date=2022 | isbn=978-981-18-3967-2 | oclc=1342054525}}

• {{Commons category-inline|Botanic Gardens MRT Station}}
• {{Official website|http://www.smrt.com.sg/Trains/NetworkMap/BotanicGardens.aspx}}

{{Singapore MRT stations|circle=yes|downtown=yes}}

{{Authority control}}

{{DEFAULTSORT:Botanic Gardens MRT station}}

Category:Railway stations in Singapore opened in 2011

Category:Tanglin

Category:Mass Rapid Transit (Singapore) stations