Thailand's longest rail tunnel has broken through. Will you really take a train to Chiang Rai in 2028?

Chiang Rai has never been on Thailand's rail network. On 11 November 2026 that took a step towards changing, when crews broke through the Ngao Tunnel in Lampang, the longest railway tunnel ever dug in Thailand. The Transport Ministry now says the new line to Chiang Rai and the Laos border at Chiang Khong should open in 2028. How realistic is that, and what would it mean for anyone who lives in or visits the north?

We read the government's own update from the Public Relations Department and checked it against reporting by Khaosod English and Thai PBS from the breakthrough ceremony. Here is what has actually been built, what is still missing, and what the announcements leave out.

What broke through on 11 November

Deputy Prime Minister and Transport Minister Phiphat Ratchakitprakarn pressed the button on the final blast at the Ngao Tunnel, in Ngao district of Lampang, part of the first construction contract between Den Chai and Ngao. Khaosod English reports the tunnel is 6,215 metres long, that digging began on 22 December 2023 and that only 24.30 metres were left before the breakthrough.

A breakthrough is not the same as a finished tunnel. The State Railway of Thailand says excavation should be complete in December, after which the inside structure, railway systems and safety equipment still have to be installed, followed by inspections and testing. The railway's governor, Anan Phonimdaeng, said the varied rock along the route, including limestone and old volcanic ash deposits, called for specialised techniques.

So is 2028 realistic?

On the government's own numbers, the project was 74.076% complete at the end of October 2026, with work split into three contracts: Den Chai to Ngao, Ngao to Chiang Rai, and Chiang Rai to Chiang Khong. The two official channels we checked gave slightly different figures for each contract, but both put the last stretch, Chiang Rai to Chiang Khong, furthest behind. With roughly a quarter of the work left and two years to go, a 2028 opening is the official target rather than a promise. We would treat any exact month as unknown until the railway publishes one.

What it could change for residents and visitors

• Chiang Rai would join the national rail network for the first time, giving a rail option alongside flights and long-distance buses.
• The route also runs through Phrae, Lampang and Phayao, so towns along the way, not only Chiang Rai, stand to gain a rail link.
• The line ends at Chiang Khong on the Mekong, a border crossing into Laos. The government frames the route as a trade link to Laos and southern China; the announcements we read did not mention cross-border passenger services.
• Freight is a big part of the plan. The Department of Land Transport reports that a border goods service centre near Chiang Khong station is 95% built and due to be finished in December.

What the announcements do not tell you

None of the statements published this week include fares, journey times, timetables or which trains will run from Bangkok. Until the State Railway of Thailand releases those, nobody can say whether a train to Chiang Rai will beat a cheap flight or an overnight bus on price or time. Road works are also under way: the ministry is widening 32.428 km of main highway in the area to four lanes, on Highway 11 between Den Chai and Lampang and Highway 103 between Rong Kwang and Ngao.