MRTA Yellow Line

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Yellow Line
SystemMetropolitan Rapid Transit
StatusUnder Construction
LocaleBangkok, Samut Prakan, Thailand
TerminiLat Phrao
Stations23 (planned)
Opened2022 (est.)
OwnerMass Rapid Transit Authority of Thailand
Operator(s)Eastern Bangkok Monorail Company Limited
Rolling stockBombardier INNOVIA Monorail 300
4 cars per trainset
Line length30.4 kilometers (18.9 mi) (est.)
Number of tracks2 monorail tracks
ElectrificationThird rail
Operating speed80 km/h (50 mph)
Route map
Lat Phrao  MRT 
Chok Chai 4
Lat Phrao 71
Lat Phrao 83
Lat Phrao 101
Bang Kapi
Yaek Lam Sali
Lam Sali  MRT 
Si Kritha
Hua Mak ARLbangkok.svg  ARL 
Khlong Kalantan
Si Nut
Srinagarindra 38
Suan Luang Ro 9
(King Rama IX Park)
Si Udom
Si Iam
Si La Salle
Si Bearing
Si Dan
Si Thepha

The Yellow Line is an elevated mass rapid transit line currently under construction in Bangkok and Samut Prakan Province, Thailand.

The 30.4-kilometre-long (18.9 mi) line will have 23 stations (plus two new proposed stations awaiting approval) and cost 55 billion baht. It was originally proposed to be an underground and elevated heavy rail line. However, it was decided in 2012 to build an elevated monorail line in order to reduce construction costs.

Preliminary site works began in late 2017 with major construction work starting from March 2018. The line is due to be operational by 2022. At the end of March 2019, construction has progressed to 30.40%[1]


The line starts at the intersection of Ratachadapisek and Lat Phrao roads where it interchanges with the MRT Blue Line at Lat Phrao station. The line then heads east along Lat Phrao road to Bangkapi junction where it will interchange with the Orange Line Lam Sali station, before heading south along Srinagarindra Road to Hua Mark where it will interchange with the Airport Rail Link Hua Mak station.

From Hua Mark the route continues south along Srinagarindra Road past Bangna-Trat Road all the way to Thepha Rak Road in Samut Prakan Province, then heading west along Thepha Rak Road before terminating at Samrong of the BTS Sukhumvit Line.[2]

The line will be built from Ratchada (Y1) to Samrong (Y23), with construction planned to take four years to complete. The Yellow Line depot will be located at Debaratana Road adjacent to Si Iam station. [3]


The line was first proposed by the Office of Transport and Traffic Policy and Planning (OTP) in 2004 as a heavy rail underground and elevated metro line as part of the 10 line metro plan which was taken to the February 2005 election. In 2009, it was suggested to change the line to an elevated monorail line as a cost saving measure. In December 2011, the MRTA was instructed by the MOT to divide the Yellow Line into two phases for tender and construction purposes and to control land appropriation costs.[4] In June 2012, the MRTA contracted consultants to undertake detailed designs of the Yellow Line. In February 2013, OTP stated that the tender for the Yellow Line should be ready by late 2013 for tender in early 2014.[5] By August 2013, this timeline had changed to a mid-2014 tender date.[6]

However, similar to the MRT Pink Line, delays in finalising the technical requirements of the tender in relation to the selection of monorail rolling stock which determines the type of track to be constructed resulted in further delays. The subsequent political turmoil of late 2013 and early 2014 caused even more delay. Thereafter, the coup of May 2014 resulted in a new military administration and the tender being deferred for 2014. The MRTA tender was subsequently not released until mid-2016. In early December 2016, BSR Joint Venture (comprising BTS Group Holdings which owns 75%, Sino-Thai Engineering and Construction - STEC, and Ratchaburi Electricity Generation Holding - RATCH), won the bid for the line. The BSR also won the bid for the Pink Line. [7]

On June 16 2017, a contract was signed for the line with the Mass Rapid Transit Authority of Thailand and a consortium including BTS Group Holdings, Sino-Thai Engineering and Construction, and Ratchaburi Electricity Generation Holding. BSR has also established Eastern Bangkok Monorail Company Limited to operate the monorail. A proposed 2 station extension of the route north from the current Ratchada terminus to link to Sukhumvit Line Extension at Ratchayothin station is awaiting approval from the government.[8]

Construction Progress[edit]

Construction of the MRT Yellow Line began in March 2018 with the BSR consortium establishing a number of preparation work sites along the Lat Phrao rd with the closure of lanes along this traffic dense east-west corridor. By August 2018, construction had expanded to along the Srinakarin rd section which is also where the depot will be built [9] By 30 September 2018, overall construction had progressed to 9.61% [10] At the end of March 2019, construction has progressed to 30.40%[11]

Rolling stock[edit]

BSR has selected Bombardier INNOVIA 300 monorail rolling stock for the Yellow line.[12] The BSR has announced that they will purchase 28, 4 car sets to operate the Yellow line.[13]

List of planned stations[edit]

The 30.4 km Yellow Line will have 25 stations (with two proposed station):[14]

Code Station Name Transfers Opening Province
YLEX-02 Phaholyothin 24 (proposed extension)  BTS  Phaholyothin 24 2022 Bangkok
YLEX-01 Chankasem (proposed extension)
Y1 Ratchada  MRT  Lat Phrao
Y2 Phawana
Y3 Chok Chai 4
Y4 Lat Phrao 71
Y5 Lat Phrao 83  MRL  Chalong Rat
Y6 Mahatthai
Y7 Lat Phrao 101
Y8 Bang Kapi
Y9 Yaek Lam Sali  MRT  Lam Sali
Y10 Si Kritha
Y11 Phatthanakan  SRT  Hua Mak
ARLbangkok.svg  ARL  Hua Mak
Y12 Khlong Kalantan
Y13 Si Nut
Y14 Srinagarindra 38
Y15 Suan Luang Ro 9 (King Rama IX Park)
Y16 Si Udom
Y17 Si Iam  BTS  Wat Si Iam (proposed)
Y18 Si La Salle
Y19 Si Bearing Samut Prakan
Y20 Si Dan
Y21 Si Thepha
Y22 Thipphawan
Y23 Samrong  BTS  Samrong

Potential future extension[edit]

When completed the Yellow Line will terminate at Samrong. A future extension from Samrong across the Chao Phraya River to link with the MRT Purple Line at Rat Burana has been canvassed by OTP.

See also[edit]


  1. ^ MRTA Press, 12 April 2019
  2. ^ MRTA route of the Yellow Line (In Thai) Archived 2013-11-21 at the Wayback Machine
  3. ^ "2Bangkok Yellow Line thread" Semi-regular updates, articles, pictures and commentary (In English)
  4. ^ "ฐานเศรษฐกิจ - Connecting Opportunity". Retrieved 27 August 2016.
  5. ^ "Archived copy". Archived from the original on 2013-12-16. Retrieved 2014-06-27.CS1 maint: Archived copy as title (link)
  6. ^
  7. ^ "BSR Joint venture wins rights for Bangkok's Yellow, Pink line MRTA construction". Bangkok Post. 7 December 2016.
  8. ^ "Junta to call bids for most infra projects - The Nation". The Nation. Retrieved 2017-06-17.
  9. ^ "Construction of monorail lines gets ceremonial launch". Bangkok Post. 27 August 2018.
  10. ^ MRTA Press, 12 October 2018
  11. ^ MRTA Press, 12 April 2019
  12. ^
  13. ^
  14. ^ "รายงานการเปลี่ยนแปลงรายละเอียดโครงการ ในรายงานการวิเคราะห์ผลกระทบสิ่งแวดล้อม (รายงานฉบับสมบูรณ์) โครงการรถไฟฟ้า สายสีเหลือง ช่วงลาดพร้าว - สำโรง" (PDF) (in Thai).

External links[edit]