MRT Blue Line

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Blue Line
MRT (Bangkok) logo.svg
BangkokMetro SiLomStation.jpg
Train arriving at Si Lom Station
Native name สายเฉลิมรัชมงคล
Type Heavy Rail
System MRT
Locale Bangkok
Termini Bang Sue
Hua Lamphong
Stations 18
Opened 3 July 2004
Owner Mass Rapid Transit Authority
Depot(s) Phra Ram 9
Line length 21 km (13 mi)
Number of tracks 2
Track gauge 1,435 mm (4 ft 8 12 in)
Electrification Third rail
Operating speed 80 km/h (50 mph)
Route map
Tha Phra  MRT 
Charan Sanit Wong 13
Yaek Fai Chai
Bang Khun Non  MRT 
Bang Yi Khan
Bang Phlat
Bang O
Chao Phraya River
Bang Pho
Tao Poon  MRT 
Up arrow extension opens 12 Aug 2017[1]
Bang Sue
Bang Sue Central
under construction
 SRT   SRT  ARLbangkok.svg  ARL 
Kamphaeng Phet
Chatuchak Park
Phahon Yothin
Lat Phrao
Huai Khwang
Thailand Cultural Centre  MRT 
Rama 9 Depot
Phra Ram
ARLbangkok.svg  ARL 
Queen Sirikit
National Convention Centre
Khlong Toei
Si Lom
Sam Yan
Hua Lamphong
Down arrow Under construction
Wat Mangkon
Wang Burapha  MRT 
Sanam Chai
Chao Phraya River
Tha Phra  MRT 
Bang Phai
Bang Wa
Phetkasem 48
Phetkasem Depot
Phasi Charoen
Bang Khae
Lak Song

The MRT Chaloem Ratchamongkhon line (Thai: รถไฟฟ้ามหานคร สายเฉลิมรัชมงคล) or MRT Blue line (Thai: รถไฟฟ้ามหานคร สายสีน้ำเงิน) is the first of Bangkok's MRT system and the city's third rapid transit line, following the Sukhumvit line and Silom line of the BTS Skytrain. Opened on 3 July 2004,[2] it runs eastward from Bang Sue station in Chatuchak District along Kamphaeng Phet, Phahon Yothin and Lat Phrao Roads, then turns south following Ratchadaphisek Road, then west following Rama IV Road to Hua Lamphong station in Pathum Wan District.

A much delayed 27 km extension to the Blue line finally began construction in mid-2012 due for completion in April 2019, two years later than planned.[3]


For the Blue Line most civil infrastructure was provided by a new government agency, the Mass Rapid Transit Authority of Thailand (MRTA), and handed over to a private-sector operator for a 25-year concession agreement. The winning bidder was Bangkok Metro Company Limited (BMCL), subsequently renamed Bangkok Expressway and Metro Public Company Limited (BEM). BMCL/BEM provide maintenance & engineering equipment, including electrical trains, signalling systems, SCADA, communication, platform screen doors and fully operates the system. BMCL/BEM has subcontracted maintenance of the system for 10 years to Siemens and seven-year maintenance contracts to two local maintenance services.[4]

The construction of the first Bangkok Metro line, officially known as Chaloem Ratchamongkhon (Thai สายเฉลิมรัชมงคล) – "Celebration of Royal Auspice" – or informally as the "Blue Line", began on 19 November 1996. The project suffered multiple delays not only because of the 1997 economic crisis, but also due to challenging civil engineering works of constructing massive underground structures deep in the water-logged soil upon which the city is built.

The Blue line was opened for a limited public trial period of several weeks starting on 13 April 2004. On 3 July 2004 the line was officially opened at 19:19 local time by HM King Bhumibol and Queen Sirikit,[2] who were accompanied by other members of the royal family. Within 30 minutes of its opening, sightseers filled the system to its maximum capacity, but after the initial rush ridership settled down to around 180,000 riders daily — considerably lower than projections of over 400,000, despite fares being slashed in half from 12-38 baht to 10-15 baht per trip. By 2016 the average daily ridership was 273,637.[5]


Inside the train of MRT blue line, Siemens Modular Metro.

The 21-kilometre, 19-station Blue line presently runs from Bang Sue to Hua Lamphong via Phra Ram 9 and has a carrying capacity of 40,000 people in each direction per hour. Similar to the Skytrain, the Metro uses trains supplied by Siemens that travel at up to 80 km/h. Passengers can change to the Skytrain at Si Lom, Sukhumvit and Chatuchak Park stations. The metro has a large depot in Huai Khwang district, which is located between Phra Ram 9 and Thailand Cultural Centre stations.

Due to safety considerations, platform screen doors are installed. Uniformed security personnel and security cameras are present at each and every platform. Currently 19 three-car metro trains, of the Siemens Modular Metro type, are used. Each metro train consists of two motor cars and a centre trailer car.[6]


Station Name
Station Name
Change for
TAO Tao Poon (opening on 11 August 2017)[7] เตาปูน  MRT  Bang Sue
BAN Bang Sue บางซื่อ  SRT  (under construction)  SRT  (planned) ARLbangkok.svg  ARL  (proposed) inter-city rails Chatuchak
KAM Kamphaeng Phet กำแพงเพชร
CHA Chatuchak Park สวนจตุจักร  BTS 
PHA Phahon Yothin พหลโยธิน  BTS  (under construction)
LAT Lat Phrao ลาดพร้าว    (planned)
RAT Ratchadaphisek รัชดาภิเษก Din Daeng/Huai Khwang
SUT Sutthisan สุทธิสาร
HUI Huai Khwang ห้วยขวาง
CUL Thailand Cultural Centre ศูนย์วัฒนธรรมแห่งประเทศไทย  MRT  (proposed)
RAM Phra Ram 9 พระราม 9 Grand Square Phra Ram 9 Monorail (proposed)
PET Phetchaburi เพชรบุรี ARLbangkok.svg  ARL   SRT  (proposed) inter-city rails Ratchathewi
SUK Sukhumvit สุขุมวิท  BTS  Watthana
SIR Queen Sirikit National Convention Centre ศูนย์การประชุมแห่งชาติสิริกิติ์ Khlong Toei
KHO Khlong Toei คลองเตย
LUM Lumphini ลุมพินี  BMA  (proposed) Sathon
SIL Si Lom สีลม  BTS  Bang Rak
SAM Sam Yan สามย่าน  BTS  (proposed) Pathum Wan
HUA Hua Lamphong หัวลำโพง  SRT  (proposed) inter-city rails
BS10 Wat Mangkon (under construction) วัดมังกร Samphanthawong
BS11 Sam Yod (under construction) สามยอด  MRT  (Tao Pun-Rat Burana Extension, proposed) Phra Nakhon
BS12 Sanam Chai (under construction as of December 2016)[8] สนามไชย
BS13 Itsaraphap (under construction) อิสรภาพ Bangkok Yai
BS14 Tha Phra (under construction) ท่าพระ  MRT  (Bang Sue-Tha Phra Extension, under construction)

Major accident record[edit]

On 17 January 2005, just after 09:15, an empty train returning to the depot collided with a peak-hour train filled with passengers at the Thailand Cultural Centre station. 140 people were hurt, most of whom sustained only minor injuries, and the entire Metro network was shut down for two weeks.

After initial investigations, it was found that the empty train had run into problems shortly before the accident, grinding to a halt on a curve leading to the depot. The driver applied its brake and was waiting to be towed to the maintenance centre close to Thailand Cultural Centre station.

A rescue train was attempting to connect to the stalled train when the driver was told to release the brake while coupling had not yet been successful. It was then that the empty train began to roll backwards at a speed of ten metres per second, before smashing into the other train, which was carrying passengers. Therefore, it was believed that the incident was caused by negligence due to insufficient training of operation staff.[9] This accident also resulted in two damaged trains with heavily damaged areas limited to the two leading cars. The colliding speed was suspected to be about 60 km/h due to the appearance of damaged areas. However, one train, which was rebuilt from the repair of the minor-damaged cars, was already fitted for operation at the end of 2006 and the remaining one was still under heavy repair until mid of 2007; it was released into service in October 2007. The cost resulting from the accident might be a much higher figure than BMCL quoted, and it was expected to be at least 400 million baht, which was totally insured by a local insurance company.

The Metro resumed full operation on 1 February 2005, and passenger numbers soon rose back to pre-crash levels, partly due to a temporary promotional fare scheme which allowed passengers to travel any distance on the MRT for only ten baht (~0.33 USD).

Current extension under construction[edit]

Bang Wa MRT Station in June 2016 (under construction)
Viaduct across Ratchaphruek Road east of Bang Wa Station in June 2016 (under construction)

The 27 km Blue Line extension will form a quasi circle line (loop). It consists of 19 stations (4 underground stations and 15 elevated stations). (The current terminus at Bang Sue is being extended 1.2 km to Tao Poon as part of the Purple Line project).

From Tao Poon the line will run elevated west along Pracha Rat Sai 2 rd, cross the Chao Praya river and then run south along the Ratchadapisek inner ring road (Charan Sanit Wong rd) terminating at Tha Phra. From the current Hualomphong terminus the line runs 5.4 km underground through Chinatown, under the Chao Praya river to Tha Phra station where it surfaces. It then runs west along Phetkasem road to Lak Song.

The project is divided into 5 contracts:

  • Contract 1: 2.8 km underground from Hua Lamphong to Sanam Chai

(2 stations, Bt11.65 Billion, contractor ITD).

  • Contract 2: 2.6 km underground Sanam chai-Tha Phra

(2 stations, for Bt10.82B, contractor CK)

  • Contract 3: 11 km elevated from Tao Poon along Charan Sunit Wong rd (Inner Ring rd) to Tha Phra

(8 stations, Bt11.40B, contractor SH-Unique Joint venture)

  • Contract 4: 10.5 km elevated from Tha Phra along Phetkasem rd to Lak Song

(7 stations, plus a park-and-ride venue and maintenance yard, Bt13.43B, contractor STEC)

  • Contract 5: rolling stock and systems, Bt5.17 Billion, contractor CK.

As of July 2014, civil works progress was 52% done.[10] By October, civil works were 63.75% done. As of January 2017, civil works were 89.16% done.[11] The first section of the Blue Line extension is expected to open in late 2018 with the full extension open by April 2019.

Future extension[edit]

Since 2011, there were requests from residents to further extend the line from Lak Song further west to the Phutthamonthon area. The MRTA has indicated a willingness to undertake this extension. In July 2014, the MRTA submitted a request for 84 million baht to complete a route survey for a 7.8 km extension from Lak Song to Phutthamonthon Sai 4.[12] In late March 2017, the Transport Ministry stated that this 7.8 km extension would be submitted to Cabinet for approval in April 2017. The expected timeframe is for construction to commence in the 4th quarter of 2017.[13]

See also[edit]


  1. ^
  2. ^ a b "ทอดพระเนตรศูนย์ควมคุมการปฏิบัติการรถไฟฟ้ามหานคร ซึ่งตั้งอยู่บริเวณเขตหัวยขวาง - Ourking". Ourking (in Thai). 2004-07-03. Retrieved 2017-04-14. 
  3. ^ "รถไฟฟ้าสายสีน้ำเงิน อุโมงค์ลอดใต้แม่น้ำเจ้าพระยา" [Blue Line Tunnel under the river]. Voice TV21 (in Thai). 3 February 2015. 
  4. ^ "Mass Rapid Transit Authority of Thailand". Retrieved 2017-04-14. 
  5. ^ "Financial Summary of the Consolidated Financial Statements of Bangkok Expressway and Metro Public Company Limited and its Subsidiaries" (PDF). 2017. 
  6. ^ "Bangkok's first underground metro open". International Railway Journal. July 2004. Retrieved 2008-08-30. 
  7. ^ "ส.ค.เชื่อมแน่รถไฟฟ้าฟันหลอ "เตาปูน-บางซื่อ" รฟม.แนะวิธีใช้บริการ". 
  8. ^ "7 Bangkok's underground Sanam Chai subway station, decorated in a Thai royal hall style, is opened for a tour by lawmakers and journalists."
  9. ^ "Thai subway shut for safety probe". BBC News. 17 January 2005. Retrieved 13 May 2010. 
  10. ^ "คมนาคมตามความคืบหน้ารถไฟฟ้า 10 สาย เร่งสีม่วงเปิดปลายปี’58 ชงคสช.อนุมัติอีก 6 สาย" [Transport under accelerated progress Metro Purple Line 10 opened in late '58. NBC maker. Approved by 6 lines.] (in Thai). 28 July 2014. 
  11. ^ "เปิดแน่ ส.ค.นี้! ครม.ปลดล็อก "1 สถานี" รฟม.ลุยเซ็นจ้าง BEM ส่วนสีน้ำเงินตลอดสายเปิด มี.ค. 63" (in Thai). 14 February 2017. 
  12. ^ "ลุ้นคลังไฟเขียวงบรถไฟ-รฟม" [Win No Green Light Railway Company - MRTA]. Than Online (in Thai). 15 July 2014. 
  13. ^ "Blue Line extension, freeway pends Cabinet approval". The Bangkok Post. Bangkok. 26 March 2017. Retrieved 28 March 2017. 

External links[edit]