Conductress Li Jing shows the "Quiet Car" service prompt card on high-speed train G8609 from Chengdu East Railway Station in southwest China's Sichuan Province to Shapingba Railway Station in southwest China's Chongqing on Dec. 24, 2020. Some high-speed trains in China have piloted "quiet cars" for passengers who opt for a quiet and undisturbed travel experience. The "quiet car" is often the No. 3 carriage on the train, with onboard videos muted and announcements made at a lower volume. Doors at the ends of the carriage will be closed to reduce noise from the vestibule. The service is now available on some trains of the Beijing-Shanghai high-speed railway and Chengdu-Chongqing high-speed railway, starting from Thursday. (Photos: Xinhua)

A conductress stands at the entrance of the "Quiet Car" of the high-speed train G8609 from Chengdu East Railway Station in southwest China's Sichuan Province to Shapingba Railway Station in southwest China's Chongqing on Dec. 24, 2020.

Conductress Li Jing explains the notice of taking "Quiet Car" to passengers on high-speed train G8609 from Chengdu East Railway Station in southwest China's Sichuan Province to Shapingba Railway Station in southwest China's Chongqing on Dec. 24, 2020.

Photo taken on Dec. 24, 2020 shows the "quiet car" service promotional video on the "quiet car" of the G2 bullet train of the Beijing-Shanghai high-speed railway, which links Beijing, capital of China, and east China's Shanghai.

A passenger reads the service prompt card on the "quiet car" of the G2 bullet train of the Beijing-Shanghai high-speed railway, which links Beijing, capital of China, and east China's Shanghai on Dec. 24, 2020.

Staff members promote the "quiet car" service in front of the G2 bullet train of the Beijing-Shanghai high-speed railway at Hongqiao Railway Station in east China's Shanghai, Dec. 24, 2020.

A passenger rests in the "quiet car" on the G2 bullet train of the Beijing-Shanghai high-speed railway, which links Beijing, capital of China, and east China's Shanghai on Dec. 24, 2020.