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$Aerial photo shows a service station for high-speed trains in Kunming City, Southwest China\'s Yunnan Province, May 9, 2019. Nearly 30 workers helped lay the last rail measuring 25 meters in length and weighing 2.5 tons on Thursday, completing the rail-laying work for the service station. Successful expansion of the station will improve the use and maintenance of high-speed trains in Yunnan, also making it the largest such service station in southwest China. (Photo: China News Service/Miu Chao)$

Aerial photo shows a service station for high-speed trains in Kunming City, Southwest China's Yunnan Province, May 9, 2019. Nearly 30 workers helped lay the last rail measuring 25 meters in length and weighing 2.5 tons on Thursday, completing the rail-laying work for the service station. Successful expansion of the station will improve the use and maintenance of high-speed trains in Yunnan, also making it the largest such service station in southwest China. (Photo: China News Service/Miu Chao)

$Photo shows a service station for high-speed trains in Kunming City, Southwest China\'s Yunnan Province, May 9, 2019. Nearly 30 workers helped lay the last rail measuring 25 meters in length and weighing 2.5 tons on Thursday, completing the rail-laying work for the service station. Successful expansion of the station will improve the use and maintenance of high-speed trains in Yunnan, also making it the largest such service station in southwest China. (Photo: China News Service/Miu Chao)$

Photo shows a service station for high-speed trains in Kunming City, Southwest China's Yunnan Province, May 9, 2019. Nearly 30 workers helped lay the last rail measuring 25 meters in length and weighing 2.5 tons on Thursday, completing the rail-laying work for the service station. Successful expansion of the station will improve the use and maintenance of high-speed trains in Yunnan, also making it the largest such service station in southwest China. (Photo: China News Service/Miu Chao)

$People work at a service station for high-speed trains in Kunming City, Southwest China\'s Yunnan Province, May 9, 2019. Nearly 30 workers helped lay the last rail measuring 25 meters in length and weighing 2.5 tons on Thursday, completing the rail-laying work for the service station. Successful expansion of the station will improve the use and maintenance of high-speed trains in Yunnan, also making it the largest such service station in southwest China. (Photo: China News Service/Miu Chao)$

People work at a service station for high-speed trains in Kunming City, Southwest China's Yunnan Province, May 9, 2019. Nearly 30 workers helped lay the last rail measuring 25 meters in length and weighing 2.5 tons on Thursday, completing the rail-laying work for the service station. Successful expansion of the station will improve the use and maintenance of high-speed trains in Yunnan, also making it the largest such service station in southwest China. (Photo: China News Service/Miu Chao)