Lampang:The Ngao Tunnel, Thailand's longest railway tunnel, has successfully been breached as part of the Den Chai-Chiang Khong railway line extension. This significant milestone marks the opening of a new railway line that connects Chiang Khong, enhancing trade and economic ties between Thailand, Laos, and the broader region.
According to Thai News Agency, Deputy Prime Minister and Minister of Transport, Mr. Pipat Ratchakitprakarn, led the breakthrough ceremony at Ngao District, accompanied by key officials, including Mr. Anan Pothinimdaeng, Governor of the State Railway of Thailand (SRT), and other senior executives.
The Den Chai - Chiang Rai - Chiang Khong double-track railway project aims to connect four northern provinces to border trade gateways, facilitating international trade. The Ministry of Transport has projected the completion and operational readiness of this railway line by 2028. Designed to enhance travel and freight transport, this project is a cornerstone in developing a north-south rail network, connecting the Thai railway network to the Lao border.
The 6,215-meter-long Ngao Tunnel, built in Lampang Province, is part of this ambitious infrastructure project. The tunnel poses significant engineering challenges due to its complex geological conditions and requires specialized construction techniques. The SRT has adopted an adit tunnel boring method to improve construction efficiency, with an expected completion timeline for the entire tunnel excavation by November 2026.
The Den Chai-Chiang Rai-Chiang Khong railway, stretching approximately 323.1 kilometers, will provide additional travel options and enhance transportation safety. It will also facilitate the movement of agricultural and industrial products, thereby improving economic opportunities along its route. As of October 2026, the project has reached 74.076% completion, with efforts underway to ensure its readiness by the 2028 target.