Passengers prepare to board a train in Shenzhen North railway station in Shenzhen, south China's Guangdong Province, Jan 7, 2023. The Spring Festival travel rush this year, will continue for 40 days from Jan 7 to Feb 15. Photo:Xinhua

Passengers prepare to board a train in Shenzhen North railway station in Shenzhen, south China's Guangdong Province, Jan 7, 2023. Photo:Xinhua

A worker examines a train at a maintenance base in Wuhan, central China's Hubei Province, Jan 6, 2023. Photo:Xinhua

This stitched panoramic aerial photo shows bullet trains in a maintenance base in Wuhan, central China's Hubei Province, Jan 7, 2023. Photo:Xinhua

Passengers prepare to board a train in Shenzhen North railway station in Shenzhen, south China's Guangdong Province, Jan 7, 2023. Photo:Xinhua

Passengers are seen in Shenzhen North railway station in Shenzhen, south China's Guangdong Province, Jan 7, 2023. Photo:Xinhua

Passengers prepare to board a train in Shenzhen North railway station in Shenzhen, south China's Guangdong Province, Jan 7, 2023. Photo:Xinhua

Trains are pictured at Shenzhen North railway station in Shenzhen, south China's Guangdong Province, Jan 7, 2023. Photo:Xinhua

This aerial photo shows bullet trains at a maintenance base in Wuhan, central China's Hubei Province, Jan 7, 2023. Photo:Xinhua

A worker examines a train at a maintenance base in Wuhan, central China's Hubei Province, Jan 6, 2023. Photo:Xinhua

A worker examines a train at a maintenance base in Wuhan, central China's Hubei Province, Jan 6, 2023. Photo:Xinhua