Yellow Line (Bangkok)

The MRT Yellow Line is an elevated monorail line in Bangkok and Samut Prakan Province, Thailand, part of the MRT rapid transit system. The 30.4 km (18.9 mi) line has 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 a heavy rail underground line along Lat Phrao road which was then elevated from Lam Sali Intersection to Samrong. However, it was decided in 2012 to build an elevated monorail line for the whole length in order to reduce construction costs.

Yellow Line
สายสีเหลือง
A Bombardier Innovia Monorail 300 at Bang Kapi station
Overview
OwnerMass Rapid Transit Authority of Thailand
LocaleBangkok and Samut Prakan, Thailand
Termini
Stations23
Websitehttps://mrta-yellowline.com
Service
TypeMonorail
SystemMetropolitan Rapid Transit
Operator(s)Eastern Bangkok Monorail Company Limited
(Subsidiary of BSR Consortium)
Depot(s)Si Iam
Rolling stockBombardier Innovia Monorail 300
4 cars per trainset
Daily ridership72,807
History
Opened3 July 2023
Technical
Line length30.4 kilometers (18.9 mi) (est.)
Number of tracks2 monorail tracks
CharacterElevated
Electrification750 V DC
Operating speed80 km/h (50 mph)
SignallingBombardier CITYFLO 650 moving block CBTC ATC under ATO GoA 4 (Fully Automated Train Control), with subsystems of ATP, ATS and CBI
Route map

Lat Phrao
 MRT 
Phawana
Chok Chai 4
Lat Phrao 71
Lat Phrao 83
Mahat Thai
Lat Phrao 101
Bang Kapi
Yaek Lam Sali
 MRT 
Si Kritha
Hua Mak
Kalantan
Si Nut
Srinagarindra 38
Suan Luang Rama IX
Si Udom
Debaratana-Si Iam
Maintenance Center
Si Iam
Si La Salle
Si Bearing
Si Dan
Si Thepha
Thipphawan
Samrong
 BTS 

The Yellow Line provides mass transit along the heavily congested Lat Phrao Road and Srinagarindra Road corridors. The line links 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 Line, the Airport Rail Link (Bangkok) and finally the BTS Sukhumvit Line. As such, it is 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 Yellow Line by October 2021 with initial operations running from Samrong to Si Iam. The line was then planned to fully open in July 2022. However, due to COVID-19 outbreaks in Bangkok delaying construction with sites closed, the BSR stated that the first section of the line would not open until July 2022. On 29 November 2021, daily testing began on a 6 km (3.7 mi) section of the line between the depot at Si Iam and Srinagarindra 38 station. Testing was expanded after a 3-month period.

In mid-April 2022, the Director of EBM/BSR, Mr Surapong Laoha-Unya, stated that further labour & installation delays would mean that the line would now not open until September 2022. Construction had progressed to 99.02% as of the end of April 2023.

After repeated delays, the line partially opened to the public for free trial rides on 3 June 2023 from Hua Mak to Samrong, having done a private trial ride between Kalantan and Samrong for the press the day before. Trial rides for Phawana to Hua Mak section began on 12 June, while the final section between Phawana and Lat Phrao station opened on 19 June.

Rabbit Card or EMV credit cards are accepted on the MRT Yellow Line, although pricing is yet to be determined.

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