Lampang:The State Railway of Thailand (SRT) has completed the Ngao Tunnel, Thailand's longest railway tunnel, measuring 6.2 kilometers. This significant development opens a new railway line to Chiang Khong, aiming to connect the economies of Thailand, Laos, and the broader region.
According to Thai News Agency, the tunnel breakthrough ceremony was presided over by Mr. Pipat Ratchakitprakarn, Deputy Prime Minister and Minister of Transport. The Ngao Tunnel is part of the Den Chai-Chiang Rai-Chiang Khong double-track railway project, which will link four northern provinces to border trade gateways with a projected completion by 2028.
The Ministry of Transport, through the SRT, announced that the Ngao Tunnel, located in Lampang Province, is a milestone in Thailand's rail infrastructure development. The 6,215-meter-long tunnel is a component of the new railway project that will enhance travel, freight transport, and international trade, laying the groundwork for a major rail system connecting the northern and southern regions of the country.
Mr. Pipat emphasized that the tunnel breakthrough represents not only an engineering achievement but also a strategic step towards linking provinces such as Phrae, Lampang, Phayao, and Chiang Rai to Chiang Khong, a key gateway for Thai-Lao border trade. The project also aims to boost logistics competitiveness and provide more travel and economic opportunities in the region.
The Den Chai-Chiang Rai-Chiang Khong railway, spanning approximately 323.1 kilometers, is expected to provide additional rail travel options, enhancing convenience and safety for the public. It will also facilitate the transport of agricultural products, industrial goods, and international cargo, creating economic opportunities along the railway line.
The SRT has utilized specialized construction techniques to tackle the engineering challenges posed by the mountainous terrain and complex geology of the Ngao Tunnel. The excavation began in December 2023, with the entire process expected to complete by December 2026, followed by internal construction and system installations.
As of October 2026, the railway project is 74.076% complete, with efforts underway to expedite the remaining construction while adhering to quality and safety standards. The project aims to open for public service by 2028, supporting the expansion of travel and freight transportation in Thailand's northern region.