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Aerial photo taken on Jan. 8, 2020 shows electric multiple unit (EMU) trains after maintenance at a maintaining base in Shenyang, northeast China's Liaoning Province. (Xinhua/Yang Qing)
 
 
Aerial photo taken on Jan. 8, 2020 shows electric multiple unit (EMU) trains after maintenance at a maintaining base in Shenyang, northeast China's Liaoning Province. (Xinhua/Yang Qing)