DRT tightens watch on longest rail tunnel - Bangkok Post

The Den Chai–Chiang Rai–Chiang Khong railway project is over 70% complete, with the 6.2km Ngao Tunnel expected to be Thailand's longest railway tunnel upon completion. The line is scheduled to open for service in 2028. Photo: The State Railway of Thailand The Department of Rail Transport (DRT) has stepped up inspections of the Den Chai–Chiang Rai–Chiang Khong line, now 70.6% complete, as work continues on Thailand's longest rail tunnel.

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