Sichuan-Tibet Railway climbs from Sichuan Basin to "Roof of the World"

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A track laying machine works at the construction site of the section between Lhasa and Nyingchi of the Sichuan-Tibet Railway in Gonggar County of southwest China's Tibet Autonomous Region, Oct. 16, 2018. The Sichuan-Tibet Railway climbs from the Sichuan Basin several hundred meters above sea level to the "Roof of the World", at an altitude of more than 4,400 meters. (Xinhua/Purbu Zhaxi)

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A worker directs a track laying machine at the construction site of the section between Lhasa and Nyingchi of the Sichuan-Tibet Railway in Gonggar County of southwest China's Tibet Autonomous Region, Oct. 16, 2018. The Sichuan-Tibet Railway climbs from the Sichuan Basin several hundred meters above sea level to the "Roof of the World", at an altitude of more than 4,400 meters. (Xinhua/Chogo)

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Workers lay railway tracks at the construction site of the section between Lhasa and Nyingchi of the Sichuan-Tibet Railway in Gonggar County of southwest China's Tibet Autonomous Region, Oct. 16, 2018. The Sichuan-Tibet Railway climbs from the Sichuan Basin several hundred meters above sea level to the "Roof of the World", at an altitude of more than 4,400 meters. (Xinhua/Chogo)

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Workers lay railway tracks at the construction site of the section between Lhasa and Nyingchi of the Sichuan-Tibet Railway in Gonggar County of southwest China's Tibet Autonomous Region, Oct. 16, 2018. The Sichuan-Tibet Railway climbs from the Sichuan Basin several hundred meters above sea level to the "Roof of the World", at an altitude of more than 4,400 meters. (Xinhua/Purbu Zhaxi)

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A track laying machine works at the construction site of the section between Lhasa and Nyingchi of the Sichuan-Tibet Railway in Gonggar County of southwest China's Tibet Autonomous Region, Oct. 16, 2018. The Sichuan-Tibet Railway climbs from the Sichuan Basin several hundred meters above sea level to the "Roof of the World", at an altitude of more than 4,400 meters. (Xinhua/Chogo)

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A track laying machine works at the construction site of the section between Lhasa and Nyingchi of the Sichuan-Tibet Railway in Gonggar County of southwest China's Tibet Autonomous Region, Oct. 16, 2018. The Sichuan-Tibet Railway climbs from the Sichuan Basin several hundred meters above sea level to the "Roof of the World", at an altitude of more than 4,400 meters. (Xinhua/Purbu Zhaxi)