MRTA Yellow Line
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|System||Metropolitan Rapid Transit|
|Locale||Bangkok, Samut Prakan, Thailand|
|Owner||Mass Rapid Transit Authority of Thailand|
|Operator(s)||Eastern Bangkok Monorail Company Limited|
Bombardier INNOVIA Monorail 300|
4 cars per trainset
|Line length||30.4 kilometers (18.9 mi) (est.)|
|Number of tracks||2 monorail tracks|
|Operating speed||80 km/h (50 mph)|
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 of the monorail due to begin in the 2nd quarter of 2018. The line is due to be operational in 2022.
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.
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 Hua Mark adjacent to Y11 station. 
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. In June 2012, the MRTA contracted consultants to undertake detailed designs of the Yellow Line. In February 2013, OTTP stated that the tender for the Yellow Line should be ready by late 2013 for tender in early 2014. By August 2013, this timeline had changed to a mid-2014 tender date.
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. 
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.
List of planned stations
The 30.4 km Yellow Line will have 25 stations (with two proposed station):
|YLEX-02||Phaholyothin 24 (proposed extension)||Phaholyothin 24||2022||Bangkok|
|YLEX-01||Chankasem (proposed extension)|
|Y3||Chok Chai 4|
|Y4||Lat Phrao 71|
|Y5||Lat Phrao 83||Chalong Rat|
|Y7||Lat Phrao 101|
|Y9||Yaek Lam Sali||Lam Sali|
|Y11||Phatthanakan|| Hua Mak|
|Y15||Suan Luang Ro 9 (King Rama IX Park)|
|Y17||Si Iam||Bang Na-Suvarnabhumi Line Si Iam|
|Y18||Si La Salle|
|Y19||Si Bearing||Samut Prakan|
Potential future extension
- Bangkok Metro
- MRT Brown Line
- MRT Blue Line
- MRT Grey Line
- MRT Light Blue Line
- MRT Orange Line
- MRT Pink Line
- MRT Purple Line
- SRT Red Lines
- Bangkok BRT
- BTS Skytrain
- Sukhumvit Line
- Silom Line
- Airport Rail Link (Bangkok)
- SRT Red Lines
- Bangkok BRT
- Other planned monorail lines in Bangkok include the Gold Line.
- MRTA route of the Yellow Line (In Thai) Archived 2013-11-21 at the Wayback Machine.
- "2Bangkok Yellow Line thread" Semi-regular updates, articles, pictures and commentary (In English)
- "ฐานเศรษฐกิจ - Connecting Opportunity". Retrieved 27 August 2016.
- "Archived copy". Archived from the original on 2013-12-16. Retrieved 2014-06-27.
- "BSR Joint venture wins rights for Bangkok's Yellow, Pink line MRTA construction". Bangkok Post. 7 December 2016.
- "Junta to call bids for most infra projects - The Nation". The Nation. Retrieved 2017-06-17.
- "รายงานการเปลี่ยนแปลงรายละเอียดโครงการ ในรายงานการวิเคราะห์ผลกระทบสิ่งแวดล้อม (รายงานฉบับสมบูรณ์) โครงการรถไฟฟ้า สายสีเหลือง ช่วงลาดพร้าว - สำโรง" (PDF) (in Thai).
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