MRT Purple Line

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MRT Chalong Ratchadham line
รถไฟฟ้ามหานคร สายฉลองรัชธรรม
MRT (Bangkok) logo.svg
MRT Purple Line Train T013 20160806.jpg
MRT Purple Line train
Type Rapid transit
System MRT
Status Operational
Locale Bangkok and Nonthaburi Province, Thailand
Termini Tao Poon (Bang Sue District)
Khlong Bang Phai (Bang Bua Thong District)
Stations 16
Services 1
Opened 6 August 2016; 8 months ago (2016-08-06)
Owner Mass Rapid Transit Authority of Thailand (MRTA)
Operator(s) Bangkok Expressway and Metro Public Company Limited (BEM)
Character Elevated
Rolling stock 21 3-car J-TREC trainsets
Line length 23 kilometers (14 mi) (est.)
Track gauge 1,435 mm (4 ft 8 12 in) standard gauge
Electrification Third rail
Operating speed 80 km/h (50 mph)
Route map
PP1 Khlong Bang Phai
To Main Depot Right arrow
PP2 Talat Bang Yai
PP3 Sam Yaek Bang Yai
PP4 Bang Phlu
PP5 Bang Rak Yai
PP6 Bang Rak Noi - Tha It
PP7 Sai Ma
Chao Phraya River
PP8 Phra Nangklao Bridge
PP9 Yaek Nonthaburi 1
PP10 Bang Kraso
 MRT  Pink Line:
Min Buri Right arrow
PP11 Nonthaburi Civic CenterBSicon exTRAM.svg
PP12 Ministry of Public Health
PP13 Yaek Tiwanon
PP14 Wong Sawang
 SRT  Light Red Line:
Left arrow Taling Chan – Bang Sue Right arrow
PP15 Bang SonBSicon exTRAM.svg
PP16 Tao Poon
 MRT  Blue Line:
Left arrow Tha Phra – Bang Sue Right arrow
Future Extension
Kiakkai(New parliament)
Si Yan
Sam SenBSicon exTRAM.svg
National Library
Bang Khun Phrom
Democracy MonumentBSicon exTRAM.svg
 MRT  Orange Line:
Left arrow Taling Chan – Min Buri Right arrow
Wang BuraphaBSicon exTRAM.svg
 MRT  Blue Line:
Left arrow Bang Khae – Hua Lamphong Right arrow
Chao Phraya River
 SRT  Dark Red Line:
Left arrow Maha Chai – Hua Lamphong Right arrow
Wongwian YaiBSicon exTRAM.svg
 BTS  Silom Line:
Left arrow Bang Wa – Siam Right arrow
Chom Thong
Dao Khanong
Bang Pakok
Phacha Uthit
Rat Burana

The MRT Purple line (Thai: รถไฟฟ้ามหานคร สายสีม่วง), officially the MRT Chalong Ratchadham line (Thai: รถไฟฟ้ามหานคร สายฉลองรัชธรรม), is a rapid transit line of Bangkok's Metropolitan Rapid Transit system for the Mass Rapid Transit Authority of Thailand (MRTA) in the Bangkok Metropolitan Region and Nonthaburi Province. It opened for service on 6 August 2016 and is the second line operated by MRT and the city's fifth rapid transit line, following the Sukhumvit Line, Silom Line, MRT Blue Line, and Airport Rail Link.


The MRT Purple Line platform at Khlong Bang Phai MRT Station

The Purple Line serves travellers between the northwestern suburbs of Bangkok in Nonthaburi Province and the southern area of Thonburi in Rat Burana District. It runs through downtown along Samsen Road, passing the Rattanakosin old quarter and historical places in Dusit and Phra Nakhon District: the national library, Thewet market, Bang Lamphu, the Democracy Monument, the Golden Mount, Phahurat, the Memorial Bridge, and the Wongwian Yai roundabout. It will also serve the new Thai parliament at the Kiak Kai intersection.

The line is divided into two sections, 23 km from Tao Poon - Khlong Bang Phai, which is operational, and 19.8 km from Tao Poon - Rat Burana. The first section was originally scheduled to be open in late 2014,[1] but was delayed until August 2016.

This is the first Bangkok metro line into an adjacent province: the northern terminus, Khlong Bang Phai Station, is in Bang Bua Thong, Nonthaburi Province.

There is a one kilometre missing link between the Purple Line's terminus at Tao Poon and the MRT Blue line at Bang Sue. An extension to the Blue Line is under construction to join the two lines. Until completion, passengers must take shuttle buses to transfer between the two lines. The missing link is blamed for low ridership, with only 22,000 daily passengers compared to projected numbers of 100,000.[2]

The line is indicated by the colour purple on network maps.


The Platform level of Bang Phlu MRT Station
MRT Purple Line Route Map, Tao Poon Station
Ticket Vending machines at Khlong Bang Phai MRT Station
Entrance to Tao Poon station, MRT Purple Line
Khlong Bang Phai MRT Station

The Tao Poon - Khlong Bang Phai section starts from the Tao Poon elevated station at Tao Poon junction, where it transfers to the MRT Blue Line extension. It runs north on a viaduct along Krung Thep-Nonthaburi Road, providing transfer to the Red commuter railway at Bang Son railway station, and approaches Mueang Nonthaburi District of Nonthaburi Province. The line goes further north via Tiwanon Road, passes the Ministry of Public Health, then turns at the Khae Rai junction to west Nonthaburi via Rattanathibet Road, passes the Nonthaburi Government Centre, crosses the Chao Phraya River on a viaduct parallel to the Phra Nangklao Bridge. Then it continues to a large residential area in Bang Yai District and turns to the north along Kanchanaphisek Road, passes Bang Yai market, and terminates at Khlong Bang Phai in Bang Bua Thong District. The total length is 23 kilometres (14 mi).

Construction contracts[edit]

Construction is divided into three separate contracts. The first covers Bang Sue - Tao Poon - Phra Nangklao Bridge, a distance of 12 km, with nine stations. This contract includes construction of a 1.2 km extension of the MRT Blue Line from Bang Sue to Tao Poon where the Blue Line and the Purple Line will interchange.

The second contract covers the Phra Nangklao Bridge (including a new bridge) - Bang Yai District - Khlong Bang Phai terminus, with a length of 11 km and seven stations. The third contract is for the construction of a train depot at the Bang Yai terminus and four park and ride buildings at Khlong Bang Phai, Sam Yaek Bang Yai, Tha It, and the Yaek Nonthaburi stations.

Contract Notes Kilometre
1 Bang Sue-Tao Pun to Phra Nangklao Bridge 12
2 Phra Nangklao Bridge to Khlong Bang Phai terminus (river crossing viaduct included) 11
3 Depot at Khlong Bang Phai, four park and ride stations
4 Rolling Stock and Management - BMCL (Joint Development)
5 Signalling and Electrical - Bang Yai to Taopoon
6 Trackwork

In September 2013, BEM (operator of the MRT Blue Line) signed an 82.6 billion baht contract with the MRTA for the procurement of rolling stock, installation of E&S systems, and operation and maintenance of the Purple Line. The concession is for a 30-year period.[3]

The sixth contract, which was due to be awarded in mid-2011 for the laying of track was delayed for over one year due to internal disputes within the MRTA and uncertainty about the bidding process.[4] However, this contract was finalised in October 2012.

In October 2012, BEM, private operator of the MRT Blue line, was granted a 30-year concession to operate the Purple Line and supply rolling stock and electrical systems.[5]

As of July 2014, civil works construction was 94 percent complete[6] which is three percent behind schedule.[7] As of October 2014, civil works were stated to be 99% complete.[8]

Rolling stock[edit]

In November 2013, BEM contracted with Marubeni Corp, Toshiba Corp, and East Japan Railway Company to install E&S systems, supply 63 cars of rolling stock, and provide maintenance for 10 years as part of a contract worth 12.6 billion baht.[9]

East Japan Railway train manufacturing subsidiary J-TREC built the 21 trains (three car sets) in Yokohama with the first sets delivered in early 2016.[10]


In the table below, names in italics indicate that the station is under construction and not yet in operation.

MRT Purple Line EN.svg
Name Code Distance
Platforms Transfers Location
Khlong Bang Phai คลองบางไผ่ P1 - 2 Bang Bua Thong Nonthaburi
Talad Bang Yai ตลาดบางใหญ่ P2 1.27 2
Sam Yaek Bang Yai สามแยกบางใหญ่ P3 1.56 2
Bang Phlu บางพลู P4 1.57 2
Bang Rak Yai บางรักใหญ่ P5 1.20 2
Bang Rak Noi Tha It บางรักน้อย-ท่าอิฐ P6 1.25 2 Mueang Nonthaburi
Sai Ma ไทรม้า P7 1.25 2
Phra Nangklao Bridge สะพานพระนั่งเกล้า P8 1.47 2
Yaek Nonthaburi 1 แยกนนทบุรี 1 P9 1.63 2
Bang Krasor บางกระสอ P10 1.26 2
Nonthaburi Civic Centre ศูนย์ราชการนนทบุรี P11 0.90 2 MRT Pink Line (projected)
Bangkok MRT Brown line unofficial logo.png MRT Brown Line (projected)
Ministry of Public Health กระทรวงสาธารณสุข P12 1.79 2
Yaek Tiwanon แยกติวานนท์ P13 1.20 2
Wong Sawang วงศ์สว่าง P14 1.72 2 Bang Sue Bangkok
Bang Son บางซ่อน P15 1.29 2 SRT Light Red Line (under construction)
Tao Poon เตาปูน P16 1.58 4 MRT Blue Line (opening in 9 August 2017)[11][12]

Future extension[edit]

Phase 2, south: The proposed extension from Tao Pun - Rat Burana will run south through Bangkok's old quarter from Tao Pun junction on a viaduct. It then will go into an underground structure along Sam Sen Road, passing the new Thai parliament site, and transfers to the proposed Red inner-city shortcut commuter at Sanghi intersection. It passes the national library in Dusit District before it reaches Phra Nakhon District at Thewet Market. The line turns east at Bang Lamphu and goes along the city moat to the south, with transfers possible to the planned MRT Orange Line at Ratchadamnoen Road near the Democracy Monument. It passes Golden Mount before possible transfers to the southern extension of the Blue Line at Wang Burapha near Yaowarat Road in Chinatown and the Phahurat textile market.

The line crosses the Chao Phraya River near the Memorial Bridge towards the Wongwian Yai roundabout in Thonburi on the west bank, with possible transfers to the Dark Red Line commuter and to Wongwian Yai BTS Station. It continues south to Chom Thong, then on an elevated structure for 5.5 kilometres (3.4 mi) and ends in Rat Burana District, a short distance to the nearby Phra Pradaeng suburban town in Samut Prakan Province. The total length will be about 19.8 km, including eleven underground and five elevated stations.

North: A 4.5 km extension from Bang Yai to Bang Bua Thong intersection, which is not part of the original Purple Line plan, is under consideration due to a request from the Nonthaburi governor.[13]

See also[edit]


  1. ^ Mahitthirook, Amornrat (26 November 2012). "Mall links to boost MRT's bottom line". Bangkok. Retrieved 26 November 2012. 
  2. ^ "Fare cut boosts Purple Line riders, but still below target - Bangkok Post Property finance advice". Bangkok Post. Retrieved 11 September 2016. 
  3. ^ 'Purple Line deal agreed BEM signs 30-year contract with MRTA'. Bangkok Post, 5 September 2013
  4. ^ "ITD closer to Purple Line contract". The Nation. Bangkok. 17 May 2012. Retrieved 26 November 2012. 
  5. ^ "Bangkok Purple Line contract awarded". International Railway Gazette. 22 October 2012. Retrieved 6 May 2013. 
  6. ^
  7. ^
  8. ^
  9. ^ 'Japanese firms win Purple Line deal'. Bangkok Post, 6 November 2013
  10. ^ "First Sustina export order". International Railway Gazette. 23 September 2014. 
  11. ^ "ดีเดย์! เปิดเดินรถสถานีเตาปูน-บางซื่อ 9 ส.ค.นี้". กรุงเทพธุรกิจ. 7 February 2017. Retrieved 7 February 2017. 
  12. ^ "จ้างBEMเดินรถเตาปูน-บางซื่อ". Retrieved 3 April 2017. 
  13. ^ Bid to extend Purple Line to Sai Noi intersection. The Nation, 5 May 2011

External links[edit]