Sukhumvit Line

BTS Sukhumvit Line สายสุขุมวิท
EMU-A2 from Kasetsart University station arriving at Sena Nikom station
Overview
Owner	Bangkok Metropolitan Administration
Locale	Bangkok, Samut Prakan, and Pathum Thani
Termini	Khu Khot Kheha
Stations	Total : 57 stations 47 (operational) 9 (planned) 1 (provisional)
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 four-car trains Siemens Bozankaya EMU-A2: 22 four-car trains CNR Changchun Railway Vehicles EMU-B1: 12 four-car trains CNR Changchun Railway Vehicles EMU-B2: 5 four-car trains CRRC Changchun Railway Vehicles EMU-B3: 24 four-car trains
Daily ridership	926,294 ( BTS  and  BTS ) 30 August 2024[1]
History
Opened	5 December 1999; 24 years ago (1999-12-05)
Last extension	16 December 2020; 3 years ago (2020-12-16)
Technical
Line length	Total :69.07 km (42.92 mi) 51.17 km (31.80 mi) (operational) 17.9 km (11.1 mi) (planned)
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[2][3]
Route map Legend Planned extension to Outer Ring Road-Lam Luk Ka 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 to Bangkok │ 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 Skytrain in Bangkok, 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 Khot in Lam Luk Ka District in Pathum Thani, and eastwards along Rama I, Phloen Chit and Sukhumvit Roads, through Bang Na District to Kheha Station in Samut Prakan. BTS daily ridership (2019) is 740,000 passengers per day.^[4]

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 51.17 km (31.80 mi) 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]

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

Code	Station Name		Opened	Platform Type	Park & Ride	Transfers/Notes
	English	Thai
	Khu Khot	คูคต	16 December 2020; 3 years ago (2020-12-16)	Side	√
	Yaek Kor Por Aor	แยกคปอ.		Side	√
	Royal Thai Air Force Museum	พิพิธภัณฑ์กองทัพอากาศ		Side	-
	Bhumibol Adulyadej Hospital	โรงพยาบาลภูมิพลอดุลยเดช		Side	-
	Saphan Mai	สะพานใหม่		Side	-
	Sai Yud	สายหยุด		Side	-
	Phahon Yothin 59	พหลโยธิน 59		Side	-
	Wat Phra Sri Mahathat	วัดพระศรีมหาธาตุ	5 June 2020; 4 years ago (2020-06-05)	Island	-	Interchange station with  MRT
	11th Infantry Regiment	กรมทหารราบที่ 11		Side	-
	Bang Bua	บางบัว		Side	-
	Royal Forest Department	กรมป่าไม้		Side	-
	Kasetsart University	มหาวิทยาลัยเกษตรศาสตร์	4 December 2019; 4 years ago (2019-12-04)	Side	-	Connecting station to  MRT  (future)
	Sena Nikhom	เสนานิคม		Side	-
	Ratchayothin	รัชโยธิน		Side	-
	Phahon Yothin 24	พหลโยธิน 24		Side	-
	Ha Yaek Lat Phrao	ห้าแยกลาดพร้าว	9 August 2019; 5 years ago (2019-08-09)	Island	-	Connecting station to Phahon Yothin for  MRT  , via a 330-metre elevated pedestrian walkway.
	Mo Chit	หมอชิต	5 December 1999; 24 years ago (1999-12-05)	Side	√	Connecting station to Chatuchak Park for  MRT
	Saphan Khwai	สะพานควาย		Side	-
	Sena Ruam	เสนาร่วม[6]	TBA	Side	-	Provisional station
	Ari	อารีย์	5 December 1999; 24 years ago (1999-12-05)	Side	-
	Sanam Pao	สนามเป้า		Side	-
	Victory Monument	อนุสาวรีย์ชัยสมรภูมิ		Side	-
	Phaya Thai	พญาไท		Side	-	Connecting station to; •  ARL  •  SRT  (future)
	Ratchathewi	ราชเทวี		Side	-	Connecting station to  MRT  (under construction)
	Siam	สยาม		Stacked Island	-	Cross-platform interchange with  BTS
	Chit Lom	ชิดลม		Side	-
	Phloen Chit	เพลินจิต		Side	-
	Nana	นานา		Side	-
	Asok	อโศก		Side	-	Connecting station to Sukhumvit for  MRT
	Phrom Phong	พร้อมพงษ์		Side	-
	Thong Lo	ทองหล่อ		Side	-
	Ekkamai	เอกมัย		Side	-	Connecting station to  MRL  (north section; future)
	Phra Khanong	พระโขนง		Side	-	Connecting station to  MRL  (south section; future)
	On Nut	อ่อนนุช		Side	-
	Bang Chak	บางจาก	12 August 2011; 13 years ago (2011-08-12)	Side	-
	Punnawithi	ปุณณวิถี		Side	-
	Udom Suk	อุดมสุข		Side	-
	Bang Na	บางนา		Side	-	Connecting station to Bang Na-Suvarnabhumi LRT (future)
	Bearing	แบริ่ง		Side	-
	Samrong	สำโรง	3 April 2017; 7 years ago (2017-04-03)	Island	-	Interchange station to  MRT  via transfer gates
	Pu Chao	ปู่เจ้า	6 December 2018; 5 years ago (2018-12-06)	Side	-
	Chang Erawan	ช้างเอราวัณ		Side	-
	Royal Thai Naval Academy	โรงเรียนนายเรือ		Side	-
	Pak Nam	ปากน้ำ		Side	-
	Srinagarindra	ศรีนครินทร์		Side	-
	Phraek Sa	แพรกษา		Side	-
	Sai Luat	สายลวด		Side	-
	Kheha	เคหะฯ		Side	√

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 stocks of Sukhumvit Line

EMU-A1 approaching Victory Monument station

EMU-A2 heading towards Sanam Pao station

EMU-B1/B2 approaching Ha Yaek Lat Phrao station

EMU-B3 at Ekkamai station

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.

Construction started in April 2012 on a 12.6 km (7.8 mi), 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.^[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]

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 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	Notes	Contractors	Length	Costs (million Thai Baht)
1	Mo Chit to Saphan Mai	Italian-Thai Development	2.8 km (1.7 mi)	15,269
2	Saphan Mai to Khu Khot	UN-SH-CH joint-venture	2.6 km (1.6 mi)	6,657
3	Khu Khot Depot and Park & Ride buildings at Yaek Kor Por Aor and Khu Khot stations	STEC-AS joint-venture	11 km (6.8 mi)	4,019
4	Track laying and system design	STEC-AS joint-venture	10.5 km (6.5 mi)	2,841

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.

East:

• A further 10.1 km, four station extension from Kheha station to Tamru station is feasible but currently postponed.

Code	Station Name		Planned Opening	Platform Type	Transfers
	English	Thai
↓ Continue from Kheha station ↓
	Sawangkhaniwat	สวางคนิวาส	TBA	Side
	Mueang Boran	เมืองโบราณ		Side
	Si Chan Pradit	ศรีจันทร์ประดิษฐ์		Side
	Bang Pu	บางปู		Side
	Tamru	ตำหรุ		Side

North:

• A further 7.8 km, four station extension east along Lam Luk Ka Road from Khu Khot station to Eastern Ring Road-Lam Luk Ka is feasible but currently postponed.

Code	Station Name		Planned Opening	Platform Type	Transfers
	English	Thai
↓ Continue from Khu Khot station ↓
	Khlong Sam	คลองสาม	TBA	Side
	Khlong Si	คลองสี่		Side
	Khlong Ha	คลองห้า		Side
	Eastern Ring Road-Lam Luk Ka	วงแหวนตะวันออกลำลูกกา		Side

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