Passengers are seen on a platform at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

A staff member answers questions of a passenger on a platform at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

A staff member answers questions of passengers on a platform at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

A staff member srays disinfectant on a train from Chongqingbei Railway Station to Wanzhoubei Railway Station on Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

Passengers are seen on a platform at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

Passengers are seen in a waiting hall at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

Passengers check in at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

Passengers check in at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

Passengers check in at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)

Passengers wait on a platform at Chongqingbei Railway Station in Chongqing, southwest China, Feb. 17, 2021. Wednesday marks the last day of the Spring Festival holiday. As railway stations entered the travel rush of returning passengers, Chongqing railroad department took messures to ensure that passengers travel easily and safely. (Xinhua/Huang Wei)