High-tech products applied to ensure smooth operation of railway lines during Spring Festival travel rush

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Technicians operate an unmanned submersible for checking piers of a bridge of Chengdu-Guiyang High-Speed Railway in Guiyang, southwest China's Guizhou Province, Feb. 19, 2024. Many high-tech products including unmanned submersibles have been applied to ensure smooth operation of railway lines during this year's Spring Festival travel rush which started on Jan. 26. (Xinhua/Liu Xu)

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