Construction began in May 2025, and the heaviest single beam on the bridge weighs 149.5 tonnes, by Xinhua’s figures. The final one, 32.6 metres long and about 134 tonnes, was placed by China Railway Construction Bridge Engineering Bureau Group.
The line is built under a principle Xinhua renders as unified design, independent construction and integrated commissioning: it crosses at the Gantsmod port on the Chinese side and the Gashuunsukhait port on the Mongolian, then joins Gashuunsukhait station in Umnugovi province and, through it, Mongolia’s southbound network.
Construction began in May 2025, and the heaviest single beam on the bridge weighs 149.5 tonnes, by Xinhua’s figures.
Xinhua names no cost, no commissioning date and no Mongolian official. Gashuunsukhait is the crossing through which Tavan Tolgoi’s coal reaches China by road, and the report does not say what share of the 30 million tonnes is coal.
The desert on the route complicated the work, the agency says. “The milestone lays a solid foundation for subsequent construction work.”