Staff members replenish quartz sand into the sandbox (for anti-skidding purpose) of a high-speed electrical multiple unit (EMU) train at a maintenance station in Hohhot, north China's Inner Mongolia Autonomous Region, Jan. 2, 2024. Staff members at the maintenance station were busy servicing the EMU trains on Tuesday so as to guarantee their normal operations after the New Year holiday travel rush. (Xinhua/Bei He)
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