Passengers smile and wave goodbye on a high speed train departing from Beijing West Railway station on January 26, 2024. The train is decorated with dragon-shaped characters as 2024 marks the Year of the Dragon in the Chinese calendar. China's chunyun, or Spring Festival travel rush, the world's largest annual human migration, begins on January 26, 2024. The 40-day chunyun is expected to see a new record of 9 billion passenger trips. Photos: Li Hao/GT

Passengers smile and wave goodbye on a high speed train departing from Beijing West Railway station on January 26, 2024. The train is decorated with dragon-shaped characters as 2024 marks the Year of the Dragon in the Chinese calendar. China’s chunyun, or Spring Festival travel rush, the world’s largest annual human migration, begins on January 26, 2024. The 40-day chunyun is expected to see a new record of 9 billion passenger trips. Photos: Li Hao/GT