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A staff member works at an overhaul service center for bullet trains in Guiyang, capital of southwest China's Guizhou Province, Jan. 15, 2018. (Xinhua/Liu Xu)

A staff member works at an overhaul service center for bullet trains in Guiyang, capital of southwest China's Guizhou Province, Jan. 15, 2018. (Xinhua/Liu Xu)