Contents

Sukhumvit Line

Rapid transit line in Bangkok, Thailand

BTS Sukhumvit Line สายสุขุมวิท
Two Siemens Modular Metro EMU-A1 BTS Skytrains heading to both directions.
Overview
Owner	Bangkok Metropolitan Administration (BMA)
Locale	Bangkok, Samut Prakan, and Pathum Thani
Termini	Khu Khot Kheha
Stations	47 stations 1 provisional station
Color on map	Light Green
Service
Type	Rapid transit
System	BTS Skytrain
Operator(s)	Bangkok Mass Transit System Public Company Limited
Depot(s)	Mo Chit Depot (shared with  BTS ) Khu Khot Depot Kheha Depot
Rolling stock	Siemens Modular Metro EMU-A1: 35 trains Siemens Bozankaya EMU-A2: 22 trains CNR Changchun EMU-B1: 12 trains CNR Changchun EMU-B2: 5 trains CNR Changchun EMU-B3: 24 trains
Daily ridership	1,758,544 ( BTS  and  BTS )
History
Opened	5 December 1999
Technical
Line length	51.17 km (31.80 mi)
Character	Fully elevated
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	750 V DC third rail
Operating speed	80 km/h (50 mph)
Signalling	Former: Siemens Trainguard LZB700M fixed block ATC under ATO GoA 2 (STO) Current: Bombardier CITYFLO 450 moving block CBTC ATC under ATO GoA 2 (STO), with subsystems of ATP, ATS and CBI[1][2]
Route map Legend Khu Khot Khu Khot depot Yaek Kor Por Aor Royal Thai Air Force Museum Bhumibol Adulyadej Hospital Saphan Mai Sai Yud Phahon Yothin 59 Pink Line Wat Phra Sri Mahathat  MRT  11th Infantry Regiment Bang Bua Royal Forest Department Kasetsart University Sena Nikhom Ratchayothin Phahon Yothin 24 Ha Yaek Lat Phrao  MRT  Blue Line to Lak Song Don Mueang Tollway Mo Chit depot Mo Chit  MRT  Saphan Khwai Sena Ruam (future) Ari Sanam Pao Si Rat Expressway Victory Monument Phaya Thai  ARL  Airport Rail Link to Suvarnabhumi SRT Eastern Line toBangkok │ to Chachoengsao Ratchathewi Silom Line to National Stadium Siam  BTS  Silom Line to Bang Wa Chit Lom Phloen Chit Chaloem Maha Nakhon Expressway Nana Asok Blue Line to Tha Phra (via Bang Sue) Phrom Phong Thong Lo Ekkamai Phra Khanong Chalong Rat Expressway On Nut Bang Chak Punnawithi Udom Suk Chaloem Maha Nakhon Expressway Third stage Expressway System Bang Na Bearing Samrong  MRT  Pu Chao Kanchanapisek Expressway Chang Erawan Royal Thai Naval Academy Pak Nam Srinagarindra Phraek Sa Sai Luat Kheha Samut Prakan depot Planned extension to Bang Pu This diagram: view talk edit

The Sukhumvit Line (Thai: รถไฟฟ้า สายสุขุมวิท) is an elevated metro rail line of the BTS SkytraininBangkok, Thailand. From the central Siam Station, where it connects with the Silom Line, the line runs both northwards along Phaya Thai and Phahon Yothin Roads to Khu KhotinLam Luk Ka DistrictinPathum Thani, and eastwards along Rama I, Phloen Chit and Sukhumvit Roads, through Bang Na DistricttoKheha StationinSamut Prakan. BTS daily ridership (2019) is 740,000 passengers per day.^[3]

History[edit]

The first part of the line opened in December 1999 and consisted of seventeen stations from Mo Chit to On Nut. Currently, there are 47 stations in operation for 54.25 km (33.71 mi)^[4] from origin to destination. Its formal name is The Elevated Train in Commemoration of HM the King's 6th Cycle Birthday 1st line (Thai: รถไฟฟ้าเฉลิมพระเกียรติ 6 รอบพระชนมพรรษา สาย 1).^[5]

Stations[edit]

Station N6 (Sena Ruam) has been planned since the construction of the line but has not been built.

Code	Station Name		Opened	Platform Type	Transfers/Notes	Location
	English	Thai				District	Province
	Khu Khot	คูคต	16 December 2020	Side		Lam Luk Ka	Pathum Thani
	Yaek Kor Por Aor (RTGS: Yaek Kho Po O)	แยกคปอ.		Side		Don Mueang	Bangkok
	Royal Thai Air Force Museum (RTGS: Phiphithaphan Kong Thap Akat)	พิพิธภัณฑ์กองทัพอากาศ		Side
	Bhumibol Adulyadej Hospital (RTGS: Rong Phayaban Phumiphon Adunyadet)	โรงพยาบาลภูมิพล-อดุลยเดช		Side
	Saphan Mai	สะพานใหม่		Side		Bang Khen
	Sai Yud (RTGS: Sai Yut)	สายหยุด		Side
	Phahon Yothin 59 (RTGS: Phahon Yothin Ha Sip Kao)	พหลโยธิน 59		Side
	Wat Phra Sri Mahathat (RTGS: Wat Phra Si Mahathat)	วัดพระศรีมหาธาตุ	5 June 2020	Island	Interchange station with  MRT
	11th Infantry Regiment (RTGS: Krom Thahan Rap Thi Sip Et)	กรมทหารราบที่ 11		Side
	Bang Bua	บางบัว		Side		Chatuchak
	Royal Forest Department (RTGS: Krom Pa Mai)	กรมป่าไม้		Side
	Kasetsart University (RTGS: Maha Witthayalai Kasetsat)	มหาวิทยาลัยเกษตรศาสตร์	4 December 2019	Side	Proposed connecting station to  MRT
	Sena Nikhom	เสนานิคม		Side
	Ratchayothin	รัชโยธิน		Side
	Phahon Yothin 24 (RTGS: Phahonyothin Yisip Si)	พหลโยธิน 24		Side
	Ha Yaek Lat Phrao	ห้าแยกลาดพร้าว	9 August 2019	Island	Connecting stationtoPhahon Yothin for  MRT
	Mo Chit	หมอชิต	5 December 1999	Side	Connecting stationtoChatuchak Park for  MRT
	Saphan Khwai	สะพานควาย		Side		Phaya Thai
	Sena Ruam	เสนาร่วม[6]	N/A	Side	Provisional station
	Ari	อารีย์	5 December 1999	Side
	Sanam Pao	สนามเป้า		Side
	Victory Monument (RTGS: Anusawari Chai Samoraphum)	อนุสาวรีย์ชัยสมรภูมิ		Side		Ratchathewi
	Phaya Thai	พญาไท		Side	Connecting stationto  ARL
	Ratchathewi	ราชเทวี		Side
	Siam (RTGS: Sayam)	สยาม		Stacked Island	Cross-platform interchange with  BTS	Pathum Wan
	Chit Lom	ชิดลม		Side
	Phloen Chit	เพลินจิต		Side
	Nana	นานา		Side		Khlong Toei and Watthana
	Asok	อโศก		Side	Connecting stationtoSukhumvit for  MRT
	Phrom Phong	พร้อมพงษ์		Side
	Thong Lo	ทองหล่อ		Side
	Ekkamai	เอกมัย		Side	Proposed connecting station to  MRL  (north section)
	Phra Khanong	พระโขนง		Side	Proposed connecting station to  MRL  (south section)
	On Nut	อ่อนนุช		Side
	Bang Chak	บางจาก	12 August 2011	Side		Phra Khanong
	Punnawithi	ปุณณวิถี		Side
	Udom Suk	อุดมสุข		Side		Bang Na
	Bang Na	บางนา		Side	Proposed connecting station to Bang Na-Suvarnabhumi LRT.
	Bearing (RTGS: Baering)	แบริ่ง		Side
	Samrong	สำโรง	3 April 2017	Island	Connecting stationto MRT	Mueang Samut Prakan	Samut Prakan
	Pu Chao	ปู่เจ้า	6 December 2018	Side
	Chang Erawan	ช้างเอราวัณ		Side
	Royal Thai Naval Academy (RTGS: Rongrian Nairuea)	โรงเรียนนายเรือ		Side
	Pak Nam	ปากน้ำ		Side
	Srinagarindra (RTGS: Si Nakharin)	ศรีนครินทร์		Side
	Phraek Sa (RTGS: Phraekkasa)	แพรกษา		Side
	Sai Luat	สายลวด		Side
	Kheha	เคหะฯ		Side

Operation[edit]

BTS operates services throughout the line from Khu Khot to Kheha at all times. At peak hours between 07.00-09.00 and 16.00-20.00, some "short-run" services run terminate at Mo Chit and Kasetsart University northbound, and at Samrong, eastbound. Trains run generally at three to six-minute intervals. The last eastbound trains from Khu Khot terminate at Kheha, Samrong or Ha Yaek Lat Phrao. The last northbound trains from Kheha terminate at Khu Khot, Mo Chit, or Samrong.

A few off-peak eastbound trains run a through service on the Silom Line to Bang Wa, in order to increase the line capacity at peak hours. At night, these trains will run back northbound and head to depot.^[7] Some late northbound trains on the Silom Line switch to the Sukhumvit Line at Siam to reach the depot at Mo Chit.

Rolling stock[edit]

• Siemens Modular Metro
  • EMU-A1: 35 trains
• Siemens Bozankaya
  • EMU-A2: 22 trains
  • EMU-B1: 12 trains
• CNR Changchun
  • EMU-B1: 12 trains
• CRRC Changchun
  • EMU-B3: 24 trains

Extensions and current construction[edit]

Summary of BTS Sukhumvit extensions

• 12 August 2011: On Nut (E09) – Bearing (E14)
• 3 April 2017: Bearing (E14) – Samrong (E15)
• 6 December 2018: Samrong (E15) – Kheha (E23)
• 9 August 2019: Mo Chit (N8) – Ha Yaek Lat Phrao (N9)
• 4 December 2019: Ha Yaek Lat Phrao (N9) – Kasetsart University (N13)
• 5 June 2020: Kasetsart University (N13) – Wat Phra Sri Mahathat (N17)
• 16 December 2020 Wat Phra Sri Mahathat (N17) – Khu Khot (N24).

East[edit]

1st extension to Bearing Construction started in August 2006 on a four billion baht, 5.25 km (3.26 mi) extension from On Nut (E9) to Bearing.^[8] The extension was funded by the BMA.^[9] The original scheduled opening date was mid-2009. However, a delay in tendering of the contract for the electrical and signalling 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 for this extension until the end of 2011 as compensation. An additional flat fee is charged additionally to the distance-based fare of the rest of the BTS network.

2nd extension to Kheha Construction started in April 2012 on a 12.6 km (7.8 mi), nine station extension from Bearing stationtoKheha 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.^[10]

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.^[11] 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.^[12]

The first 1.2 km (0.75 mi) section of the extension to Samrong station (E15) opened on 3 April 2017.^[13] The full extension to Kheha opened on 6 December 2018.^[14]

North[edit]

1st and 2nd extension

• 1) Mo Chit station to Saphan Mai: 11.4 km, 12 stations (N9–N20)
• 2) Saphan Mai to Khu Khot: 7.5 km, four stations (N21-N24)

An 11.4 km, 11 station northern extension from Mo Chit stationtoSaphan MaiinDon 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 16.5 km (10.3 mi), 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^[15] with an April deadline before being delayed until late May 2014 due to concerns from bidders.^[16] 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.^[17] Five bidders qualified and the successful bids were announced in December 2014.^[18] The tender specified a construction period of 1,350 days.

On 3 April 2015, MRTA signed four contracts for this extension:^[19]

• Contract 1: Civil works of 11.4 km from Mo Chit to Saphan Mai, will be constructed by Italian-Thai Development (15,269 million baht)
• Contract 2: Civil works of 7.5 km from Saphan Mai to Khu Khot, will be constructed by UN-SH-CH joint venture (6,657 million baht)
• Contract 3: Civil works of Depot and Park and Ride building, will be constructed by STEC-AS joint venture (4,019 million baht)
• Contract 4: Tracklaying and system design, will be constructed by STEC-AS joint venture (2,841 million baht)

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.^[20]

At 31 December 2017, the progress of civil works construction was at 53.31% according to the MRTA.^[21] As of the end of April 2018, the MRTA stated that civil works progress had advanced to 63.27%.^[22] As of 30 September, overall construction had progressed to 78.79%.^[23] By the end of March 2019, civil construction had nearly been completed having progressed to 99.42%.^[24]

Testing of the final 9.8 km, 7 station section from Wat Phra Sri Mahathat (N17) to Khu Khot (N24) began on 5 October.^[25] The final section was officially opened on 16 December 2020 by the Prime Minister.^[26]

Opening dates

1. The first section to Ha Yaek Lat Phrao station (N9) opened on 9 August 2019.
2. The next 4 stations from a Yaek Lat Phrao station (N9) to Kasetsart University (N13) opened on 4 December 2019.
3. The next 4 stations from Kasetsart University (N13) to Wat Phra Sri Mahathat (N17) opened on 5 June 2020.
4. The remaining section of 9.8 km and 7 stations from Wat Phra Sri Mahathat (N17) to Khu Khot (N24) opened on 16 December 2020.

Future extension plans[edit]

East:

• A further 7 km, four station extension from Kheha stationtoBang Pu station is planned.

Code	Station Name		Transfers	Location
	English	Thai		District	Province
	Sawangkhaniwat	สวางคนิวาส		Mueang Samut Prakan	Samut Prakan
	Mueang Boran	เมืองโบราณ
	Si Chan Pradit	ศรีจันทร์ประดิษฐ์
	Bang Pu	บางปู

North:

• A further 9 km, four station extension east along Lam Lukka Road from Khu Khot stationtoWongwaen-Lam Luk Ka station is planned.

Code	Station Name		Transfers	Location
	English	Thai		District	Province
	Outer Ring Road-Lam Luk Ka	วงแหวนลำลูกกา		Lam Luk Ka	Pathum Thani
	Khlong Ha	คลองห้า
	Khlong Si	คลองสี่
	Khlong Sam	คลองสาม

See also[edit]

• 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

References[edit]