Yellow Line (Bangkok)

MRT Yellow Line สายสีเหลือง
Overview
Status	Under Construction
Owner	Mass Rapid Transit Authority of Thailand
Locale	Bangkok and Samut Prakan, Thailand
Termini	Lat Phrao Samrong
Stations	23
Service
Type	Monorail
System	Metropolitan Rapid Transit
Operator(s)	Eastern Bangkok Monorail Company Limited
Rolling stock	Bombardier INNOVIA Monorail 300 4 cars per set
History
Planned opening	1st Section: June 2022
Technical
Line length	30.4 kilometers (18.9 mi) (est.)
Number of tracks	2 monorail tracks
Character	Elevated
Electrification	750 V DC
Operating speed	80 km/h (50 mph)
hide Route map Legend Ratchada Lat Phrao  MRT  Phawana Chok Chai 4 Lat Phrao 71 Lat Phrao 83 Mahatthai Lat Phrao 101 Bang Kapi Yaek Lam Sali Lam Sali  MRT  Si Kritha Phatthanakan Hua Mak  ARL   SRT  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 Thipphawan Samrong  BTS  This diagram: view talk

The MRT 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 and cost 55 billion baht. The line was originally proposed in 2005 by the Office of Transport and Traffic Policy and Planning to be an heavy rail underground line along Lat Phrao rd and then elevated from Lam Sali junction to Samrong. However, it was decided in 2012 to build an elevated monorail line for the whole length in order to reduce construction costs.

The MRT Yellow Line will provide mass transit along the heavily congested Lat Phrao road and Srinagarindra road corridors. The line will link 6 other lines; the MRT Blue Line, interchange with the MRT Orange Line (which is under construction), the planned MRT Grey Line and MRT Brown Lines, the Airport Rail Link (Bangkok) and finally the BTS Sukhumvit Line. As such, it will be an important cross city link in the middle north-eastern and eastern areas of Bangkok.

Preliminary site works began in late 2017 with major construction work starting from March 2018. In October 2020, the BSR stated that they plan to open the first section of the MRT Yellow Line by October 2021 with initial operations running from Samrong (Y23) to Si Iam (Y17).^[1] The line was then planned to fully open in July 2022.^[2] However, due to ongoing Covid-19 outbreaks in Bangkok delaying construction with sites closed, the BSR has stated that the first section will now probably not open until June 2022.^[3]

Construction progress was 85.53% by the end of July 2021.^[4]

Alignment[]

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 MRT 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.^[5]

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.

History[]

The MRT Yellow 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 MRT Yellow Line into two phases for tender and construction purposes and to reduce land appropriation costs.^[6] In June 2012, the MRTA contracted consultants to undertake detailed designs of the line. In February 2013, OTP stated that the tender for the MRT Yellow Line should be ready by late 2013 for tender in early 2014.^[7] By August 2013, this timeline had changed to a mid-2014 tender date.^[8]

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 MRT Pink Line.^[9]

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 established the 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 the BTS Sukhumvit Line Extension at Ratchayothin station has also been proposed by the BSR Joint Venture.^[10] However, this extension is opposed by the MRT Blue Line operator BEM due to concerns regarding loss of revenue.^[11]

Construction Progress[]

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.^[12] By 30 September 2018, overall construction had progressed to 9.61%.^[13] At the end of March 2019, construction has progressed to 30.40%.^[14] By the end of July 2019, civil construction had further advanced to 39.92%.^[15] At the end of October 2019, construction had progressed to 45.88%.^[16] By the end of January 2020, construction had progressed to 51.81%.^[17] By the end of May 2020, construction had progressed to 59.42%.^[18] At the end of July 2020, construction had progressed to 62.44%.^[19] At the end of September 2020, was at 66.31%.^[20] By the end of 2020, 1549 guide beams had been installed of the project total of 2388 individual guide beams. At the end of November 2020, construction had progressed to 70.64%.^[21] Construction progress was 77.97% complete by the end of February 2021.^[22] Construction progress had advanced to 82.46% complete by the end of April 2021.^[23]

Construction progress was 85.53% by the end of July 2021.^[24]

Rolling stock[]

BSR selected Bombardier INNOVIA Monorail 300 rolling stock for the MRT Yellow line.^[25] The BSR has announced that they will purchase 28, 4 car sets to operate the MRT Yellow line.^[26] These trains will be manufactured at CRRC Puzhen Bombardier Transportation factory in Wuhu, Anhui, China. The first set has been assembled and was shipped on 4 September 2020 with delivery to Thailand by the end of September 2020.^[27] The first set arrived in Thailand on 1 October at Laem Chabang port with a handover ceremony attended by the Thai Prime Minister, BTSC Chairman, MRTA and Canadian Ambassador.^[28] Two more sets are due to arrive in mid December for a total of 5 sets by the end of 2020. By July 2021, 8 sets had been delivered and were being tested. ^[29]

All sets are due to be delivered by early 2022.

Innovia Monorail 300, Line 15 (Silver), São Paulo Metro, Brazil

Technical Characteristics

• Low profile vehicles/low floor height above beam^[30]
• Distinct sloped nose/end-cap
• Inter-car walkthrough^[30]
• Rubber-tires and permanent magnet motor^[30]
• Aluminium body, steel underframe, composite end cap
• Innovia Monorails are all fully automated and are equipped with CITYFLO 650 communications-based train control for driverless operation to increase reliability, shorten head ways between trains and lower maintenance costs.^[31]

Guidebeams[]

The Bombardier INNOVIA Monorail 300 operates on a narrow, elevated guidebeam. Pre-cast, post-tensioned guidebeams are constructed at an off-site location and later installed on the system. The guidebeams are 690 mm (27 in) wide.^[30] The Innovia Monorail 300 was designed to navigate curves as tight as 46 m and a maximum grade of 6%. Monorail switches are either beam replacement or multi-position pivot switches.^[32] The system will have evacuation walkways down the entire length of the guidebeam. These walkways allow passengers to escape any onboard hazard. The maintenance crew also uses these walkways for repairs and general maintenance to the system.^[33]

List of planned stations[]

The 30.4 km Yellow Line will have 23 stations (with a proposed extension of two stations):^[34]

Code	Station Name	Transfers	Opening	Province
YLEX-02	Phaholyothin 24 (proposed extension)	BTS  Phahon Yothin 24	June 2022	Bangkok
YLEX-01	Chankasem (proposed extension)
YL1	Lat Phrao	MRT  Lat Phrao
YL2	Phawana
YL3	Chok Chai 4
YL4	Lat Phrao 71
YL5	Lat Phrao 83	MRL  Chalong Rat (proposed)
YL6	Mahatthai
YL7	Lat Phrao 101
YL8	Bang Kapi
YL9	Yaek Lam Sali	MRT  Yaek Lam Sali (under construction)  MRT  Chalong Rat (design phase)
YL10	Si Kritha
YL11	Patthanakan	SRT  Hua Mak (tender in 2022)  ARL  Hua Mak
YL12	Khlong Kalantan
YL13	Si Nut
YL14	Srinagarindra 38
YL15	Suan Luang Rama IX
YL16	Si Udom
YL17	Si Iam (Depot)	BTS  (planned)
YL18	Si La Salle
YL19	Si Bearing			Samut Prakan
YL20	Si Dan
YL21	Si Thepha
YL22	Thipphawan
YL23	Samrong	BTS  Samrong

Potential future extension[]

A proposed 2 station extension of the route north from the current Ratchada terminus to link to the BTS Sukhumvit Line Extension at Ratchayothin station has also been proposed by the BSR Joint Venture.^[35] However, this extension is opposed by the MRT Blue Line operator BEM.^[36]

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 the OTP.

See also[]

References[]

External links[]

Wikimedia Commons has media related to MRT Yellow Line.

• Official website
• Airport Rail Link, BTS, MRT & BRT network map