The specific reason remains to be investigated. Shanghai Metro responded to the emergency evacuation at Xujiahui Station: a train roof produced instant smoke
On the evening of September 16th, a warning message appeared on the platform of Xujiahui subway station in Shanghai, saying "Emergency situation, please evacuate quickly!". Netizens reported that around 6:30 pm, the subway station experienced a state of emergency. According to videos posted by netizens, smoke is generated on subway platforms.
At 19:53 on the 16th, Weibo @ Shanghai Metro shmetro released a message stating that at around 18:30 on September 16th, a train on Line 1 at Xujiahui Station produced instant smoke on the roof. The dispatch arranged for the train to clear passengers on site and withdraw from operation. Immediately after the station opened ventilation facilities, the smoke dissipated. At the same time, the station promptly adjusted the on-site passenger transportation organization measures to guide passengers to pass in an orderly manner. During this period, the smoke did not affect the safe operation of the train, and the specific reason needs further investigation. We deeply apologize for any inconvenience caused to your travel!