The Bangkok Mass Rapid Transit System currently has eight lines operated by three separate companies. There are three new lines under construction, and extensions of other lines are planned and under construction.
This is a resource page for all current and proposed urban rail transit lines in Bangkok (that includes monorails and people movers, but not Bus Rapid Transit systems). This page includes news updates for each line, and these updates are featured in the Future Southeast Asia Newsletter. Subscribe to get weekly updates on transit news in Bangkok.
Bangkok Mass Rapid Transit System Guide
Operating lines
– BTS Sukhumvit line (Light Green Line)
– BTS Silom line (Dark Green Line)
– BTS Gold line
– MRT Blue Line
– MRT Purple Line
– MRT Yellow Line
– SRT Dark Red Line
– SRT Light Red Line
– Airport Rail Link (ARL)
Under construction
– MRT Pink Line
– MRT Orange Line Eastern section
– MRT Purple Line Southern extension
– Don Mueang–Suvarnabhumi–U-Tapao high-speed railway
Proposed extensions
– MRT Orange Line Western extension
– SRT Dark Red Line extension
– SRT Light Red Line extension
– BTS Gold Line extension
Proposed new lines
– MRT Brown Line
– BMA Grey Line
– BMA Silver Line
– BMA Light Blue Line
Bangkok Mass Transit System Maps
– Current and under construction maps
– Future maps with every proposed line
Bangkok Mass Transit System videos
Operating lines
This section includes all operating lines in Bangkok. I have a more detailed overview at Nomadic Notes: Bangkok Mass Transit System – A guide to the urban railways of Bangkok.
There is no official map showing all of the lines of Bangkok, so refer to this map from Wikipedia.
[View full size. Map by Zeddlex, CC BY-SA 4.0, via Wikimedia Commons.]
BTS Sukhumvit line (Light Green Line)
Operator: Bangkok Mass Transit System Public Company Limited.
Official website: bts.co.th.
Wikipedia: Sukhumvit line.
The Sukhumvit line (Light Green line), is a 53.58 km elevated metro rail line of the BTS Skytrain.
BTS Silom line (Dark Green Line)
Operator: Bangkok Mass Transit System Public Company Limited.
Official website: bts.co.th.
Wikipedia: Silom line.
The BTS Silom line (Dark Green line), is an elevated rapid transit line of the BTS Skytrain. The line is 14.67 km in length with 14 stations, with a cross-platform interchange with the Sukhumvit line at Siam Station.
BTS Gold line
Owner: Bangkok Metropolitan Administration (BMA).
Operator: Bangkok Mass Transit System Public Company Limited.
Official website: bts.co.th.
Wikipedia: Gold Line (Bangkok).
The Gold Line is 1.72 km long automated people mover line with 3 stations. The line serves as a feeder line between the BTS Silom line and Iconsiam shopping center.
Here is our Gold Line review.
MRT Blue Line
Owner: Mass Rapid Transit Authority of Thailand.
Operator: Bangkok Expressway and Metro (BEM).
Official Website: mrta.co.th.
Wikipedia: Blue Line (Bangkok).
The MRT Blue Line is a 48 km line forming a quasi circle route of the Bangkok rapid transit network.
MRT Purple Line
Owner: Mass Rapid Transit Authority of Thailand.
Operator: Bangkok Expressway and Metro (BEM).
Official Website: mrta.co.th.
Wikipedia: Purple Line (Bangkok).
The MRT Purple line is 23 km long, serving the north-western part of Bangkok and Nonthaburi Province.
MRT Yellow Line
Owner: Mass Rapid Transit Authority of Thailand
Operator: Eastern Bangkok Monorail Company Limited.
Official Website: mrta-yellowline.com
Wikipedia: Yellow Line (Bangkok).
The MRT Yellow Line is an elevated mass rapid transit monorail line in Bangkok and Samut Prakan Province. The 30.4 km line will has 23 stations and it officially opened on 19 June 2023.
Bangkok Yellow Line: A review of the first monorail in Thailand.
SRT Dark Red Line
Owner: State Railway of Thailand.
Operator: SRTET – SRT Electrified Train Company Limited.
Wikipedia: SRT Dark Red Line.
The SRT Dark Red Line (Thani Ratthaya Line) is part of the SRT Red Line suburban railway system, running for 26 km between Bang Sue Grand Station and Rangsit.
SRT Light Red Line
Owner: State Railway of Thailand.
Operator: SRTET – SRT Electrified Train Company Limited.
Wikipedia: SRT Light Red Line.
The SRT Light Red Line (Nakhon Withi Line) is a suburban railway (or commuter railway) serving the greater Bangkok Metropolitan Region running for 15 km between Krung Thep Aphiwat Central Terminal (formerly Bang Sue Grand Station) and Taling Chan.
Airport Rail Link (ARL)
Owner: State Railway of Thailand.
Operator: Asia Era One Company Limited.
Wikipedia: Airport Rail Link (Bangkok).
The Airport Rail Link (ARL) is a 28.6 km express and commuter rail line from Suvarnabhumi Airport, via Makkasan Station, to Phaya Thai station. The express service is currently not operating, and the line will eventually form part of the 3-airports rail link.
Under construction
MRT Pink Line
Owner: Mass Rapid Transit Authority of Thailand.
Operator: Northern Bangkok Monorail Company Limited.
Official Website: mrta-pinkline.com.
Wikipedia: Pink Line (Bangkok).
The MRT Pink Line is an elevated mass rapid transit monorail train line under construction in Bangkok and Nonthaburi Province. The line will be 34.5 kilometres long with 30 stations.
MRT Orange Line Eastern section
Owner: Mass Rapid Transit Authority of Thailand
Operator: Bangkok Expressway and Metro (BEM).
Official Website: mrta-orangelineeast.com.
Wikipedia: Orange Line (Bangkok).
The MRT Orange Line is a rapid transit line under construction in two stages, with the 22.5 km Eastern section from Suwinthawong to Thailand Cultural Centre currently under construction.
MRT Purple Line Southern extension
Owner: Mass Rapid Transit Authority of Thailand.
Operator: Bangkok Expressway and Metro (BEM).
Official Website: mrta-southpurpleline.com (archived link).
Wikipedia: Purple Line (Bangkok).
The Purple Line is being extended south from Tao Poon to Rat Burana through Bangkok’s old town via both an underground and elevated route. The total planned length is 23.5 km (12.7 km underground, 10 km elevated and 0.8 km transitioning structure) with seventeen stations (ten underground and seven elevated).
Don Mueang–Suvarnabhumi–U-Tapao high-speed railway
Operator: Asia Era One Company Limited.
The High-Speed Rail Linking Three Airports Project (as it is officially known) will use the current line of the Airport Rail Link to Suvarnabhumi, with extensions to Don Muang and U-Tapao at either end.
Proposed extensions
These are proposed extensions of current lines or lines under construction that will be extended in the future.
MRT Orange Line Western extension
The Phase 2 Western extension of the Orange line will run from Thailand Cultural Centre to Bang Khun Non via Pratunam. The 13.4 km western section will run underground with 12 stations.
When fully completed, the MRT Orange line will be 35.9 km long with 29 stations.
MRT Orange Line Western extension news
BEM wins bid for Orange Line project – [09/09/22]
“The Bangkok Expressway and Metro Plc (BEM) has won the bid for the right to jointly invest with the government in the Orange Line’s western expansion project.”
SRT Dark Red Line extension
The SRT Dark Red Line is planned to be extended north from Rangsit to Thammasat University. The southern extension will go from Bang Sue to Hua Lamphong. The last section of the line will run 39.0 km southeast from Hua Lumphong to Maha Chai in Samut Sakhon Province via Wong Wian Yai along the current Maha Chai railway alignment.
SRT Light Red Line extension
The SRT Light Red Line will be extended in two directions. The eastern section will go from Bang Sue to Phaya Thai–Makkasan–Hua Mak. The western extension will go from Taling Chan to Salaya.
BTS Gold Line extension
The Gold line will be extended 1 km along Somdet Chao Phraya road to connect with the future MRT Purple Line southern extension.
Proposed new lines
These are lines that have not started construction yet, and other lines that have been proposed but are not being considered at this point.
MRT Brown Line
Owner: Mass Rapid Transit Authority of Thailand.
Wikipedia: Brown Line (Bangkok).
The MRT Brown Line is a proposed 22.1 km monorail mass transit line from Nonthaburi Civic Centre, Nonthaburi Province to Lam Sali intersection, Bang Kapi District. There will be 20 stations and interchange with 7 other mass transit lines, and the line has been integrated for 7.2km with the N2 expressway project.
BMA Grey Line
Owner: Bangkok Metropolitan Administration (BMA).
Wikipedia: Grey Line (Bangkok).
The BMA Grey Line (Watcharaphon – Thong Lo) is a planned north-south monorail line with a distance of 16.25 km with 15 planned stations. The BMA Grey will interchange with the MRT Pink Line (under construction), the proposed MRT Brown Line, the MRT Yellow Line (under construction), MRT Orange Line (under construction) and BTS Sukhumvit Line.
Read more about the Grey Line.
BMA Silver Line (Bang Na–Suvarnabhumi light rail)
Owner: Bangkok Metropolitan Administration (BMA).
Wikipedia: Bang Na–Suvarnabhumi light rail.
The BMA Bang Na–Suvarnabhumi line is a proposed light rail line that would run from Bang Na junction to Suvarnabhumi Airport.
BMA Light Blue Line
Owner: Bangkok Metropolitan Administration (BMA).
Wikipedia: Light Blue Line (Bangkok).
The Light Blue Line (Din Daeng – Sathon) is a proposed monorail line of 9.5 km with 9 stations that would link Din Daeng, Bangkok City Hall 2, Makkasan Station, and Sathon Road. This line is currently not under consideration to be built.
Bangkok Mass Transit System Maps
With multiple rail operators and no central metro website, it can be hard to find official maps. There are a number of good unofficial maps though, so every known map is listed here.
These maps are placed in two sections: current and under-construction maps, and future maps showing every proposal (even if they won’t get built).
Current and under construction maps
The official future Bangkok mass transit map is known as the M-Map. This map shows current lines and lines under construction, but not other planned lines which may or may not happen. Here is an official Thai version of the M-Map which was uploaded to Wikimedia.
[Click for full size.]
Here is a busier version of the M-Map in Thai and English (via this archived government link).
[Click for full size.]
A clearer unofficial version of the M-Map can be found at the Wiki page Mass Rapid Transit Master Plan in Bangkok Metropolitan Region. This map (“Bangkok Mass Rapid Transit System 2022”) shows lines in operation (solid) and lines under construction (with white) on real landscape scale.
[Map by Nord794ub, CC BY-SA 4.0, via Wikimedia Commons.]
Oran Viriyincy has made a great transit-style map showing current und under construction lines. The map is best viewed at bangkoktransitmap.com.
[Bangkok Transit Map by Oran Viriyincy.]
The Bangkok map by UrbanRail.Net continues to be regularly updated.
[Bangkok by UrbanRail.Net.]
The “System Map of Bangkok Rail Transit Network” by 2bangkok.com is surprisingly fresh considering that it was last updated on 9 January 2005. This map pre-empted all the M-Map lines by not distinguishing between current and under construction. This map shows the Yellow Line monorail but not the Pink Line monorail, and it shows the SRT colours differently. 2bangkok was a treasure trove of old transport and infrastructure news for Bangkok, but it is not updated.
[View full map.]
The current and under construction lines can be viewed on Google Maps by Thai Train Guide.
[View on Google Maps.]
Future maps with every proposed line
BKK Greg was one of the first to make sense of the all of the proposed lines with this Google Map showing the real line locations.
[View in Google Maps.]
Another Google Map by ikkue is titled “Bangkok Metropolitan Region’s Railway System”.
[View on Google Maps.]
The Wiki page for Mass Rapid Transit Master Plan in Bangkok Metropolitan Region also has a full map of every proposed line shown on real landscape scale. You need to click out to the full size to read it. The map creator also posted it on Reddit.
[View full size. Map by Caphtaain, CC BY-SA 4.0, via Wikimedia Commons.]
Oran Viriyincy has also made an expanded map showing every proposed line. His website has a comprehensive history of the maps of the evolving Bangkok transit system, with notes on his own work.
A transit-style map was posted by username archstudent at SkyscraperCity. This map is useful for showing Bangkok and surrounding provinces in separate colours, giving an idea of the reach into the metropolitan Bangkok area.
[View full size.]
LivingPop have created a map with every proposed line, but at this point it’s only in Thai. They have a map of current lines which is in English, so this might be updated to English as well.
[View full size.]
Bangkok Mass Transit System videos
YouTube: Evolution of the Bangkok Mass Transit System 1999-2040 (animation)
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