Sukhumvit Line

The Sukhumvit Line's initial proposal was for {{convert|12.8|km|abbr=on}} route running from N4 station to E9 station with the depot located at Lumphini Park near the Silom Line. However, this location for the depot faced backlash from the public opinion, which argued that it violated King Rama VI's intention in donating his land to establish Lumphini Park for the public. Additionally, there were protests demanding that the construction of both Skytrain lines be built underground instead of being fully elevated. Therefore, several alternative locations for the depot were considered, such as a vacant land plot in Soi Rangnam owned by the Crowned Property Bureau or the Phra Khanong pumping station in Sukhumvit 50. Ultimately, the Bangkok Metropolitan Administration decided to relocate the depot to the former site of the Northern Bus Terminal (commonly known as the Mo Chit Bus Terminal). With the decision made, the Sukhumvit Line route was extended from N4 station to N8 station. Several changes were made during the construction, as follows:{{Cite web |title=Smart EIA Plus : รายละเอียดรายงาน |url=https://eia.onep.go.th/eia/detail?id=6659#:~:text=%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%A5%E0%B8%B0%E0%B9%80%E0%B8%AD%E0%B8%B5%E0%B8%A2%E0%B8%94%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%87%E0%B8%B2%E0%B8%99-,%E0%B8%94%E0%B8%B2%E0%B8%A7%E0%B8%99%E0%B9%8C%E0%B9%82%E0%B8%AB%E0%B8%A5%E0%B8%94%E0%B9%84%E0%B8%9F%E0%B8%A5%E0%B9%8C%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%87%E0%B8%B2%E0%B8%99,-%E0%B9%80%E0%B8%A5%E0%B8%82%E0%B8%97%E0%B8%B5%E0%B9%88%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%87%E0%B8%B2%E0%B8%99%20: |access-date=2024-09-26 |website=eia.onep.go.th}}

• N3, N4, E8, and E9 stations were changed from an island platform to side platforms.
• The fully operational year was pushed from the end of 1996 to the end of 1999.
• Station designs were drastically changed from the EIA reports.
• CEN station was moved from the east side of Chaloem Phao junction to the west side.
• E1 station was moved from the east side of the Chit Lom junction to the west side, in front of Mater Dei School, with the two entrances in front of the school being canceled due to protests from school staffs and students concerned about privacy, landscape, and air pollution issues.
• E2 station was originally located between Sukhumvit 2 and Soi Nana but was later moved to the west side of the Chaloem Maha Nakhon Expressway.
• E4 station was moved from the east side of the Asok junction to the west side.

Construction started in August 2006 on a four-billion baht, {{Cvt|5.25|km}} extension from On Nut to Bearing which included 5 new stationsGroundbreaking starts on new BTS extension, Daily News, 15 August 2006 The extension was funded by the BMA.BTS extension budget cut, Bangkok Post, 15 December 2006 The original scheduled opening date was mid-2009. However, a delay in tendering the contract for the electrical and signaling works resulted in a two-year delay.

The extension did not open until over two years later, on 12 August 2011. The delay in opening prompted the BMA to offer free travel on this extension until the end of 2011 as compensation.

Construction started in April 2012 on a {{Cvt|12.6|km}}, nine station extension from Bearing station to Kheha station. The extension was funded by the MRTA as it is outside BMA city limits, Bangkok Province. Construction was contracted to take 1,350 days and the extension was originally scheduled to open by early 2017. In April 2013, the MRTA awarded Ch Karnchang the contract for track laying and electrical systems."Ch Karnchang gets Phase 2 of Bearing-Samut Prakan route" The Nation, 13 April 2013

In June 2014, civil works were stated to be 28.3 percent complete. In August 2016, the BMA agreed to take over the operation of the extension from MRTA. Delays over the agreement of how much the BMA should pay MRTA caused a delay in the commencement of test runs on the extension. Track works were 98% completed by November 2016. The total cost of the extension was estimated at 21.4 billion baht.{{Cite news |title=BMA to postpone test run of Bearing-Samrong skytrain |url=http://www.bangkokpost.com/news/general/1140841/bma-to-postpone-test-run-of-bearing-samrong-skytrain |access-date=2016-11-22 |newspaper=Bangkok Post}} In January 2017, it was announced that the opening of the extension could be further delayed to 2018-2019 due to budgetary concerns and ongoing disputes between the MRTA and BMA.{{Cite news |author=Sasiwan Mokkhasen |date=2017-01-31 |title=Green Line Going Nowhere for at Least Two Years |url=http://www.khaosodenglish.com/news/transpo/2017/01/31/green-line-going-nowhere-least-two-years/ |access-date=2017-02-25 |newspaper=Khaosod English |language=en-US}}

The first {{Cvt|1.2|km}} section of the extension to Samrong station opened on 3 April 2017.{{Cite news |author=Asaree Thaitrakulpanich |date=2017-02-24 |title=First Station of Stalled BTS Green Line to Open April 1 |url=http://www.khaosodenglish.com/news/transpo/2017/02/24/first-station-stalled-bts-green-line-open-april-1/ |access-date=2017-02-25 |newspaper=Khaosod English |language=en-US}} The full extension to Kheha opened on 6 December 2018.{{cite news |date=1 December 2017 |title=MRTA pushes to fast-track launch of South Green Line |url=https://www.bangkokpost.com/archive/mrta-pushes-to-fast-track-launch-of-south-green-line/1369887 |newspaper=Bangkok Post}}

An 11.4 km, 11 station northern extension from Mo Chit station to Saphan Mai in Don Mueang District had been planned since the Sukhumvit Line opened. Originally, this extension was scheduled to be completed by 2008. However, due to a combination of changes in government, a prolonged environmental study, and problems with locating a suitable train depot the extension was continually delayed. A further {{Cvt|16.5|km}}, nine station extension from Saphan Mai to Khu Khot was also planned once the extension to Saphan Mai had been completed.

After multiple delays, in mid-2013 a decision was made to tender extensions (1) and (2) at the same time, by the end of 2013. However, the dissolution of parliament in November 2013 delayed this yet again. A tender was finally released in January 2014{{Cite web | url=http://www.mrta.co.th/sysRegister/register131217/proc17122556.pdf | title=Invitation to tender the MRT green line (north) project | archive-url=https://web.archive.org/web/20140714185847/http://www.mrta.co.th/sysRegister/register131217/proc17122556.pdf | archive-date=2014-07-14}} with an April deadline before being delayed until late May 2014 due to concerns from bidders.{{Cite web | url=http://www.prachachat.net/news_detail.php?newsid=1401076541 | title=รฟม.ปรับทีโออาร์หมอชิต-คูคต กลางปี59 เปิดให้บริการสายสีม่วง | publisher=Prachachat News | date=26 May 2014}} A military coup in late-May 2014 suspended the bidding process whilst the military administration reviewed all major projects. In late June, the military administration affirmed that the tender would proceed before the end of 2014. In August 2014, the MRTA announced that the new tender deadline was 30 September 2014.{{cite news |title=ข่าวรอบวัน |url=http://www.prachachat.net/news_detail.php?newsid=1408439328 |newspaper=ประชาชาติธุรกิจ}} Five bidders qualified and the successful bids were announced in December 2014.{{Cite web |title=5กลุ่มบริษัทผ่านคุณสมบัติสร้างรถไฟสีเขียว คาดหาผู้รับเหมาได้ไม่เกินต้นปี58 : มติชนออนไลน์ |url=http://www.matichon.co.th/news_detail.php?newsid=1412581507 |url-status=dead |archive-url=https://web.archive.org/web/20160304031709/http://www.matichon.co.th/news_detail.php?newsid=1412581507 |archive-date=2016-03-04 |access-date=2014-10-08}} The tender specified a construction period of 1,350 days.

On 3 April 2015, MRTA signed four contracts for this extension:{{cite web |title=รฟม.เซ็นสัญญารถไฟฟ้าสายสีเขียวเหนือ เริ่มสร้างมิ.ย 58 คาดเปิดใช้ต้นปี |url=http://www.ryt9.com/s/iq03/2130477}}

File:Green Line MRT Project Photographs by Peak Hora (15).jpg

The MRTA, contactors and Thai Traffic Police met on 2 September 2015 and confirmed construction would begin on 8 September 2015. A flyover at Kasetsart was demolished, which commenced on 12 September 2015.{{cite web |title=ผู้จัดการออนไลน์ รวดเร็ว สด ทุกเหตุการณ์ |url=http://www.manager.co.th/iBizchannel/ViewNews.aspx?NewsID=9580000099688}}

At 31 December 2017, the progress of civil works construction was at 53.31% according to the MRTA.{{Cite web | url=https://www.mrta.co.th/th/news/information/ความก-าวหน-าการก-อสร-างรถไฟฟ-า-ณ-31-ธ-นวาคม-2560/ | publisher=MRTA Press | date=16 January 2018 | archive-url=https://web.archive.org/web/20210828112816/https://www.mrta.co.th/th/news/information/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%81-%E0%B8%B2%E0%B8%A7%E0%B8%AB%E0%B8%99-%E0%B8%B2%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%81-%E0%B8%AD%E0%B8%AA%E0%B8%A3-%E0%B8%B2%E0%B8%87%E0%B8%A3%E0%B8%96%E0%B9%84%E0%B8%9F%E0%B8%9F-%E0%B8%B2-%E0%B8%93-31-%E0%B8%98-%E0%B8%99%E0%B8%A7%E0%B8%B2%E0%B8%84%E0%B8%A1-2560/ | archive-date=2021-08-28 | title=ความก้าวหน้าการก่อสร้างรถไฟฟ้า ณ 31 ธันวาคม 2560 |language=th | trans-title=Progress of electric train construction as of 31 December 2017}} {{As of|2018|04|post=,}} the MRTA stated that civil works progress had advanced to 63.27%. {{As of|2018|09|30|post=,}} overall construction had progressed to 78.79%.{{cite web |title=การรถไฟฟ้าขนส่งมวลชนแห่งประเทศไทย on Facebook |url=https://www.facebook.com/MRTA.PR/photos/a.1433440196872710/2109998672550189/. |url-access=limited |archive-url=https://ghostarchive.org/iarchive/facebook/1409174012632662/2109998672550189 |archive-date=2022-04-30 |website=Facebook}}{{cbignore}}MRTA Press{{User-generated source|certain=yes|date=March 2022}} By the end of March 2019, civil construction had nearly been completed having progressed to 99.42%.{{Cite web | url=https://www.mrta.co.th/th/news/information/ความก-าวหน-าการก-อสร-างรถไฟฟ-า-ณ-30-เมษายน-2561/ | title=ความก้าวหน้าการก่อสร้างรถไฟฟ้า ณ 30 เมษายน 2561 | language=th | trans-title=Progress of electric train construction as of 30 April 2018 | archive-url=https://web.archive.org/web/20191208132503/https://www.mrta.co.th/th/news/information/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%81-%E0%B8%B2%E0%B8%A7%E0%B8%AB%E0%B8%99-%E0%B8%B2%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%81-%E0%B8%AD%E0%B8%AA%E0%B8%A3-%E0%B8%B2%E0%B8%87%E0%B8%A3%E0%B8%96%E0%B9%84%E0%B8%9F%E0%B8%9F-%E0%B8%B2-%E0%B8%93-30-%E0%B9%80%E0%B8%A1%E0%B8%A9%E0%B8%B2%E0%B8%A2%E0%B8%99-2561/ | website=MRTA Press| archive-date=2019-12-08 | date=30 April 2018}}

Testing of the final 9.8 km, seven-station-section from Wat Phra Sri Mahathat (N17) to Khu Khot (N24) began on 5 October.{{cite news |date=7 October 2020 |title=BTS tests Green Line trains at seven new stations before public opening at year-end |url=https://www.https://www.nationthailand.com/news/30395767 |url-status=dead |archive-url=https://web.archive.org/web/20130819141428/http://https/ |archive-date=19 August 2013 |access-date=17 February 2022 |newspaper=The Nation}} The final section was officially opened on 16 December 2020 by the Prime Minister.{{cite news |date=17 November 2020 |title=นับถอยหลัง 4 ธ.ค. 63 รถไฟฟ้า BTS สายสีเขียว เปิดทุกสถานี เชื่อม 3 จังหวัด |url=https://www.tnnthailand.com/content/62397 |newspaper=TNN Thailand}}

There is a plan to extend Sukhumvit Line from Kheha to Tamru for {{convert|10.1|km|abbr=on}}, including 5 additional stations: Sawangkhaniwat, Mueang Boran, Si Chan Pradit, Bang Pu, and Tamru. This extension has been suspended indefinitely until clarity is reached regarding passenger guarantees.

There is a plan to extend Sukhumvit Line from Khu Khot Station eastwards for {{convert|7.8|km|abbr=on}}, including four additional stations: Khlong Sam, Khlong Si, Khlong Ha, and Eastern Ring Road-Lam Luk Ka. This extension has been suspended indefinitely until clarity is reached regarding passenger guarantees.

{{see|List of rapid transit stations in Bangkok}}

The Sukhumvit Line has three depots: Mo Chit Depot, Khu Khot Depot, and Kheha Depot.

Mo Chit Depot serves as the central operations center for the BTS Skytrain network. It is located near Mo Chit Station, opposite Chatuchak Park, and was built as part of the original phase of the BTS Skytrain System, completed in 1999.

Khu Khot Depot, situated in the Sai Mai District of Bangkok near Khu Khot Station, was constructed as part of the Khu Khot Extension and was completed in 2019.

The third facility, Kheha Depot, is located in Mueang Samut Prakan District, Samut Prakan Province. It was built alongside the Samut Prakan Extension and completed in 2018.

Both Mo Chit and Khu Khot Depots are also shared with the Silom Line. Trains from these depots operate regular service on the Sukhumvit Line before switching to the Silom Line at Siam Station, continuing until they terminate at Bang Wa Station.

Sukhumvit Line offers five parking lots located at Mo Chit, Victory Monument, Asok, and Samrong stations. In addition, Park & Ride buildings owned and operated by the Mass Rapid Transit Authority of Thailand are available at Khu Khot, Yaek Kor Por Aor, and Kheha stations.{{Cite web |title=Park & Ride |url=https://www.bts.co.th/eng/parking/parking-page.html |access-date=2025-05-08 |website=www.bts.co.th}}

There are 55 stations on the Sukhumvit Line, all of which are elevated. Most stations feature a side platform layout, with the exceptions of Ha Yaek Lat Phrao and Samrong stations, which have island platforms. Siam Station is unique with a stacked island platform layout, allowing for a cross-platform interchange with the Silom Line.

Stations on the Sukhumvit Line are generally 150 meters in length and are equipped with half-height platform screen doors at most locations. However, some stations—such as Mo Chit, Saphan Khwai, Ari, Sanam Pao, Ratchathewi, Phloen Chit, Nana, Ekkamai, Phra Khanong, Bang Chak, Punnawithi, Udom Suk, Bang Na, and Bearing—do not have platform screen doors.

{{multiple image

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| header = Rolling stocks of Sukhumvit Line

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| image1 = Bangkok Skytrain BTS 4.jpg

| caption1 = {{center|EMU-A1 approaching Victory Monument station}}

| width1 = {{#expr: (150 * 1600/ 1200) round 0}}

| image2 = Bangkok Skytrain BTS 3.jpg

| caption2 = {{center|EMU-A2 heading towards Sanam Pao station}}

| width2 = {{#expr: (151.5 * 1600/ 1200) round 0}}

| image3 = Bangkok BTS 03.jpg

| width3 = {{#expr: (150 * 1600/ 1200) round 0}}

| caption3 = {{center|EMU-B1/B2 approaching Ha Yaek Lat Phrao station}}

| image4 = (THA-Bangkok) BTS 880-980 @ Ekkamai 2024-02-13.jpg

| width4 = {{#expr: (178 * 1600/ 1200) round 0}}

| caption4 = {{center|EMU-B3 at Ekkamai station}}

}}

The Sukhumvit Line operates from 06:00 to 24:00 every day. During rush hour, there are two main service patterns:

• Full Line operation from Khu Khot to Kheha
• Short-run train from Mo Chit to Samrong

Apart from these two service patterns, some trains might terminate at Kasetsart University and Ha Yaek Lat Phrao or operate as through-running trains to/from Bang Wa station on the Silom Line.

{{Wide image|Sukhumvit Line and Silom Line Map.svg|1600px}}

File:BTS Constitution protectors monument - the monument underpass.jpg|Sukhumvit Line viaduct at Lak Si roundabout.

File:ตึกช้าง และ รถไฟฟ้าเดินทางออกจากสถานีรัชโยธิน (Elephant Building and BTS Skytrain).jpg|EMU-A2 with Elephant Building behind at Ratchayothin station.

File:Chatuchak Park,Phahonyithin Road,Chomphon, bangkok - panoramio.jpg|Mo Chit Depot in 2013.

File:BTS Skytrain at Victory Monument.jpg|EMU-B3 at Victory Monument.

File:BTS EMU-B and EMU-B3.jpg|EMU-B1/B2 (left) and EMU-B3 at Victory Monument station.

File:Pathumwan rd and Siam area.jpg|View of Pathum Wan district.

File:Sukhumvit Line viaduct from Pathum Wan Skywalk.jpg|Sukhumvit Line viaduct from Pathum Wan Skywalk.

File:BTS Siam Station 5.jpg|The upper-level platform at Siam station in 2007, before the installation of platform screen doors

File:View from Chit Lom station.jpg|View from Chit Lom station.

File:Bangkok Skytrain 01.jpg|3-cars EMU-A1 from 2007

File:Phloen Chit Road.jpg|Phloen Chit Road with Sukhumvit Line viaduct above.

File:Sukhumwit Road with BTS Asok and Asok Montri Rd.jpg|Sukhumvit Line at Asok Junction.

File:Emsphere 21-12-2023 (1).jpg|EmSphere from Phrom Phong station.

File:ไบเทค บางนา BITEC BANGNA (3).jpg|EMU-A1 at Bang Na station with BITEC behind.

File:Samrong Station,Samutprakan (4).jpg|EMU-A2 departing Samrong station.

File:Samut Prakarn.jpg|Sukhumvit Line viaduct runs through Samut Prakan province.

• Mass Rapid Transit Master Plan in Bangkok Metropolitan Region
• BTS Skytrain
• Silom Line
• MRT (Bangkok)
• MRT Brown Line
• MRT Blue Line
• MRT Grey Line
• MRT Light Blue Line
• MRT Orange Line
• MRT Pink Line
• MRT Purple Line
• MRT Yellow Line
• AERA1 City
• SRT Dark Red Line
• SRT Light Red Line
• BMA Gold Line
• Bangkok BRT

{{reflist}}

{{Bangkok Rapid Transit stations

|Sukhumvit=yes

}}

{{Public transport in Bangkok}}

{{Urban Rail Transit in ASEAN}}

Category:BTS Skytrain lines

Category:Railway lines opened in 1999

Category:1999 establishments in Thailand

Category:Standard-gauge railways in Thailand

Category:750 V DC railway electrification