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Photo taken on Jan. 15, 2018 shows an overhaul service center for bullet trains in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Liu Xu)
 
 
Photo taken on Jan. 15, 2018 shows an overhaul service center for bullet trains in Guiyang, capital of southwest China's Guizhou Province. (Xinhua/Liu Xu)