A tunnel, a key controlling project of the Dunhuang-Golmud railway in northwest China, was completed on Friday, creating favorable conditions for the follow-up project.

Work on the 7,256-meter-long tunnel started at the end of 2012. It is located at the middle part of the Saishiteng Mountain on the border between Qinghai and Gansu at an elevation of 3,200 meters.

The 509-kilometer Dunhuang-Golmud railway is the only rail link between the Lanzhou-Xinjiang high-speed railway and the Qinghai-Tibet railway, as well as the most convenient path linking Xinjiang, Qinghai, Gansu and Tibet.

After completion, the Dunhuang-Golmud railway will form the first closed railway network in northwest China, together with the Lanzhou-Qinghai railway, Lanzhou-Xinjiang high-speed railway and the Qinghai-Tibet railway, thus shortening the journey between Xinjiang's Urumqi and Tibet's Lhasa by 2,000 kilometers.

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