High-speed rail in Thailand

• Eastern HSR to U-Tapao Airport
• Northeastern HSR to Nakhon Ratchasima
• Southern HSR to Hua Hin

• Northern HSR to Phitsanulok
• Northeastern HSR extension to Nong Khai

• Northern HSR extension to Chiang Mai
• Southern HSR extension to Surat Thani
• Southern HSR extension to Padang Besar
• Eastern HSR extension to Trat

The China–Thailand high-speed rail link under construction, Khon Kaen, 16 May 2017

In November 2014, Thailand and China signed a memorandum of understanding agreeing to construct the Thai portion of the transnational railway running from Kunming, China to the Gulf of Thailand. In November 2015, both parties agreed to a division of labour. Under the framework, a joint venture would be set up to run the project. China would conduct feasibility studies, design the system, construct tunnels and bridges, and lay track. Thailand would conduct social and environmental impact studies, expropriate land for construction, handle general civil engineering and power supply, and supply construction materials.

Once built, China would operate and maintain the system for the first three years of operation. Between the third and the seventh years, both countries would share responsibility. Later Thailand would take on responsibility with China as adviser. China would train Thai personnel to operate and maintain the system.

Dual standard-gauge tracks would be laid throughout the project. In Thailand, two routes would diverge at a junction in Kaeng Khoi District in Saraburi Province. One to connect Bangkok to Kaeng Khoi. The other route to connect Kaeng Khoi with Map Ta Phut of Rayong Province. From Kaeng Khoi tracks would lead north to Nakhon Ratchasima and on to Nong Khai Province. Construction would be divided into four sections: Bangkok-Kaeng Khoi, Map Ta Phut-Kaeng Khoi, Kaeng Khoi-Nakhon Ratchasima, Nakhon Ratchasima-Nong Khai.

Construction of Thailand's 873-kilometre-long portion of the railway system started in December 2017 [8][9] and the Phase 1 line is due to open in 2023.[10] It will connect to a 417 km line from Vientiane to the northern Lao border and a 520 km line from the Lao border to Kunming.[11]

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.[12] 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.[13] 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.[14]

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.[15] 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.[16][17]

Two rival consortia vied for the airport link contract.[18] 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.[19] Negotiations were further complicated by the resignation of the entire board of the State Railway.[20] On 16 October 2019, news reports announced that the CP consortium intends to sign the rail deal on 25 October.[21] Tanit Sorat, Vice-Chairman of the Employers' Confederation of Thai Trade and Industry, said that the contract signing delays are "...unlikely to affect the project because the government will carry out the project smoothly."[19] 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.[22]

Japan would provide Shinkansen technology for a high-speed rail link between Bangkok and the northern city of Chiang Mai. Phase 1 would connect Bangkok to Phitsanulok. It is estimated to cost 280 billion baht. Seven stations are planned for this segment: Bang Sue, Don Mueang, Ayutthaya, Lopburi, Nakhon Sawan, Phichit, and Phitsanulok. To reduce costs, Thai authorities have proposed reducing the number of stations, but the Japan International Cooperation Agency (JICA) has rejected this suggestion on the grounds that it defeats the original purpose of the project.[23] This portion of the route was scheduled to be submitted to the Thai cabinet for financial approval in August 2018.[23]

After an initial cooperation agreement was signed in 2015, the Thai government formally requested the technical and financial assistance of the Japanese government in late-2016 for the building of the Northern HSR line to Chiang Mai.[24] The Japanese completed a feasibility study which estimated that the project will cost 420 billion baht to build.[25]

A feasibility study by JICA in mid-2018 reported that the train as planned would run at a loss. JICA's study projects only 10,000 passengers per day on the route, as opposed to the 30,000 per day forecasted in the original planning proposals. To be profitable from ticket sales would require 50,000 fares per day.[23]

The Thai government announced in September 2019 that it may cancel Bangkok-Chiang Mai high-speed rail project after private investors declined to invest. The cost of the 670 kilometre line is estimated to be 400 billion baht. Japan has turned down the project as a bad investment due to low passenger projections. [26]

This line would link Bangkok with Hua Hin. It would be 211 km long and estimated costs in 2016 were 152 billion baht.[27]