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<p>Two railroad engineers applied the emergency brakes just in time when they discovered that the road ahead had been destroyed by flash flooding in northeast China's Mudanjiang City, Heilongjiang Province. The 800 passengers onboard returned safely thanks to the engineers' quick response.</p><p><span style="color: rgb(127, 127, 127);">（Video source: CGTN, compiled by Zhao Yifan）</span></p>