The Don Mueang–Suvarnabhumi–U-Tapao high-speed railway, officially known as the High-Speed Rail Linking Three Airports Project () is the second High-Speed rail line project in Thailand, being due to open in 2029https://www.bangkokpost.com/thailand/general/2493950. Bangkok Post. 2023-01-29 between Don Mueang International Airport, Suvarnabhumi Airport and U-Tapao International Airport. It will be operated by Asia Era One Company Limited, a special-purpose vehicles by the consortium of Charoen Pokphand Group Company, Limited (CP) and partners Ch. Karnchang PLC. (CK), Bangkok Expressway and Metro PLC. (BEM), Italian-Thai Development PLC. (ITD) and China Railway Construction Corporation Limited (CRCC).
This project is part of the Eastern Economic Corridor of Thailand.
The project has made virtually no progress as of the end of 2025. In July 2026, the State Railway of Thailand confirmed that Asia Era One submitted a formal notice invoking its right to terminate the joint investment contract. According to SRT governor, the consortium stated that it could not obtain all required Board of Investment (BOI) privileges within the contractual deadline, preventing SRT from issuing the Notice to Proceed. History
A HSR line to the eastern seaboard was first proposed in 1996, but there was no progress for over a decade. In 2009, the government requested the Office of Transport and Traffic Policy and Planning (OTP) to create a plan for new HSR network in Thailand that included an eastern HSR line to Rayong. The route was finalised before the 2011 election with the promise to begin construction the next year if the government was re-elected, but they lost the election. After the 2011 election, the new government reviewed all HSR plans and the SRT stated that the line would be tendered in early-2014. After the May 2014 coup there were further delays while the military government reviewed all HSR lines, initially deferring all projects. In early-2016, the government agreed to proceed with the eastern HSR route and suggested that it could be extended to Don Mueang International Airport beyond the terminus at Bang Sue Intercity Terminal thus providing a link with three airports. Extending the line would provide a link between Don Mueang Airport, Suvarnabhumi Airport, and U-Tapao International Airport in Ban Chang District.
During 2017, OTP and the Ministry of Transport in consultation with the SRT agreed that by extending the line to terminate at Don Mueang it would effectively include the long delayed extension of the Airport Rail Link (Bangkok) from Makkasan Station to Don Mueang Airport as part of the project. The Eastern Economic Corridor Office (EEC Office) in October 2017 finalised previous OTP plans to build the 10 station Eastern HSR line linking Don Mueang Airport, Bang Sue, Makkasan, Suvarnabhumi Airport, Chonburi, Si Racha, Pattaya, U-Tapao Airport, and Rayong. In early-2018, the section to Rayong was excluded due to environmental and safety concerns and it was decided that the line would terminate at U-Tapao Airport.
The SRT stated that the first tenders for the Eastern HSR line are expected to be tendered by May 2018 with a four month auction period before the contract is awarded. The cost of the project was estimated to be over 200 billion baht, of which the Thai Government would fund 123 billion baht and the private sector estimated to contribute 90 billion baht.
Impact Trains on the route are projected to have a speed of 250 kilometres per hour over the 220 km distance when it opens. According to Kanit Sangsubhan, Secretary-General of the Eastern Economic Corridor (EEC) Office, tourist numbers will increase by eight percent due to the train. "It will handle 15 million passengers in the next five years, 30 million passengers in the next 15 years and 60 million passengers in the next 20 years," Mr Kanit said. Without specifying a time frame, he said the route will generate a return of 700 billion baht. It is expected to create 19,000 new jobs in the EEC according to the Employers Confederation of Thai Trade and Industry.
Construction contracts and progress Two rival consortia vied for the airport link contract. The Charoen Pokphand (CP) Group-led consortium consisting of Italian-Thai Development, China Railway Construction Corporation Ltd, CH. Karnchang, and Bangkok Expressway and Metro, won the project with a 224 billion baht bid in December 2018. Their winning bid is valid until 8 November 2019. Until 16 October 2019, the consortium had refused to sign the contract, citing land expropriation and eviction problems and the consortium's request that the government share the risk in the project. Negotiations were further complicated by the resignation of the entire board of the State Railway. On 16 October 2019, news reports announced that the CP consortium intends to sign the rail deal on 25 October. The project was eventually approved in October 2019 as a public private partnership between the Thai government and Charoen Pokphand/China Railway Construction Corporation. The assets will revert to state ownership after 50 years.
Construction project The high-speed rail project connecting three airports involves constructing a route over the existing Airport Rail Link to connect to the three main airports in Bangkok and its surrounding areas: Don Mueang Airport, Suvarnabhumi Airport, and U-Tapao Airport in Rayong Province. This also includes connections between Bangkok and the Eastern Economic Corridor (EEC). The construction details are as follows:
Phase One (Don Mueang - Suvarnabhumi - U-Tapao) (Preparation for construction)
Don Mueang Airport - Krung Thep Aphiwat
Distance: 14 kilometers After leaving Bangkok Central Station, the train will run along Vibhavadi Rangsit Road, parallel to the Dark Red Line suburban railway, passing through Laksi district, intersecting with the Pink Line at the intersection with Chaeng Wattana Road, and ending at Don Mueang Station.
Krung Thep Aphiwat - Phaya Thai
Distance: 7.8 kilometers After passing Phaya Thai Station, the train line gradually descends to underground level, then turns right and runs along Chitralada Palace, Ramathibodi Hospital Faculty of Medicine, at Kamphaeng Phet 5 Road, passing Chitralada Royal Railway Station, Ratchawithi Railway Station, and Sam Sen Railway Station, before elevating back to level 4 to enter the platform at Bangkok Central Station.
This extension was planned to accommodate passengers from Bangkok Central Station Aphiwat, allowing them to connect to the city's airport transfer station and Suvarnabhumi Airport. Passengers from Suvarnabhumi Airport would also be able to access Bangkok Central Station Aphiwat as well. However, the latest plan has cancelled the stop at Ratchawithi Station because the MRT Orange Line no longer connects to this project at that station, making a stop there unnecessary.
Phaya Thai - Lat Krabang
Distance: 23.4 kilometers
This section already exists as part of the Airport Raillink.
Lat Krabang - U-Tapao The areas the route passes through are: Chachoengsao Province (Mueang Chachoengsao District, Ban Pho District), Chonburi Province (Mueang Chonburi District, Si Racha District, Bang Lamung District, Sattahip District), and Rayong Province (Ban Chang District).
The route, after leaving Suvarnabhumi Airport, would turn right and run along the Eastern Railway line, entering Chachoengsao province. It would then change direction, running along the Eastern Railway line on the coast, entering Chonburi and Rayong provinces. Before turning right and descending to an underground level, it would pass under Sukhumvit Road in the U-Tapao Airport commercial area and stop under Terminal 3 of U-Tapao Airport. From there, it would exit U-Tapao and turn right, terminating at Rayong railway station. The total distance was 193.5 kilometers. However, due to environmental control issues in the section passing through the Map Ta Phut Industrial Estate, a new environmental impact assessment is required. Therefore, the U-Tapao - Rayong section has become a future study route instead, reducing the total distance to 170 kilometers from Lat Krabang station.
12 stations
The train service is divided into two main types and three sub-types: City Line adds 7 stations, running from Suvarnabhumi Station to Chachoengsao Station and then returning to Don Mueang Station. HST is divided into the Standard Line, which is a service that picks up and drops off passengers at every station from Chachoengsao onwards, except for the stations between Hua Takhe and Bang Toei, and the Airport Express, which is the service that goes non-stop to U-Tapao Airport Station only.
Phase two (currently under detailed route study).
U-Tapao - Trat
The areas that the route passes through include Ban Chang District, Mueang Rayong District, and Klaeng District in Rayong Province; Mueang Chanthaburi District in Chanthaburi Province; and Mueang Trat District in Trat Province. After leaving U-Tapao Airport, the route turns right, passing through the Map Ta Phut Industrial Estate, entering Rayong Railway Station and Klaeng Railway Station, crossing into Chanthaburi Province, entering Chanthaburi Railway Station, and ending the entire route at Trat Railway Station in Mueang Trat District, Trat Province. Four educational stations . The train service operates exclusively on the HST Standard Line.
Service Local connections Station ThaiCity RouteStandard Train Airport Express Type Distance (km) Transfers LocationPhase 1: Don Mueang - Phaya (Airport Rail Link Extension)Don Mueangดอนเมือง ●●●elevated -20.122 Dark Red LineNortheastern HSR Line Don Mueang, BangkokKrung Thep Aphiwatกรุงเทพอภิวัฒน์ ●●●ground level with elevated platforms-6.375 Dark Red Line Light Red Line Blue Line Chatuchak, BangkokPhase 2: Airport Rail LinkPhaya Thaiพญาไท ● elevated 0.179 Light Red Line Sukhumvit Line Ratchathewi, BangkokRatchapraropราชปรารภ ● elevated 0.982 Orange Line Ratchathewi, BangkokMakkasanมักกะสัน ●●● ground level with elevated platforms 3.000 Light Red Line Blue Line Ratchathewi, BangkokRamkhamhaengรามคำแหง ● elevated 7.399 Light Red Line Suan Luang, BangkokHua Makหัวหมาก ● elevated 12.305 Light Red Line Yellow Line Suan Luang, BangkokBan Thap Changบ้านทับช้าง ● elevated 17.267 Prawet, BangkokLat Krabangลาดกระบัง ● elevated 23.498 Lat Krabang, BangkokSuvarnabhumiสุวรรณภูมิ●●● underground 28.812 Bang Phli, Samut PrakanPhase 3 : Suvarnabhumi - U-Tapao (Intercity Rail)Hua Takhe (King Mongkut's University of Technology)หัวตะเข้ (พระจอมเกล้าลาดกระบัง)●elevatedKhlong Luang Phaengคลองหลวงแพ่ง●elevatedKhlong Udom Chon Chonคลองอุดมชลจร●elevatedPrengเปรง●elevatedKhlong Khwaeng Klanคลองแขวงกลั่น●elevatedBang Phra Canalคลองบางพระ●elevatedBang Toeiบางเตย●elevatedChachoengsao ฉะเชิงเทรา ●● ground level with elevated platforms 64.839 Mueang Chachoengsao, ChachoengsaoChonburi ชลบุรี ● ground level with elevated platforms 113.449 Mueang Chonburi, ChonburiSi Racha ศรีราชา ● ground level with elevated platforms 136.119 Si Racha, ChonburiPattaya พัทยา ● ground level with elevated platforms 160.929 Pattaya, ChonburiU-Tapao อู่ตะเภา ● ●underground 196.410 Ban Chang, Rayong
Extension
A future phase 2 extension could extend as far as Trat. However, a 2020 feasibility study raised questions about its value.
Present status
2025 Dec: Construction has not commenced due to the pending cabinet approval for the revised financial terms of the contract and lack of required land acquisition. Construction will take 5 years, with the revised target completion date of 2030.rail contract under review again, Bangkok Post, 26 Nov 2025.
See also
High-speed rail in Thailand
References