Passengers get tickets from self-service machines at West Kowloon Station in Hong Kong, south China, Sept. 23, 2019. Monday marked the first anniversary of the launch of Hong Kong section of Guangzhou-Shenzhen-Hong Kong Express Rail Link. (Xinhua/Lu Ye)

Passengers depart from the West Kowloon Station in Hong Kong, south China, Sept. 23, 2019. Monday marked the first anniversary of the launch of Hong Kong section of Guangzhou-Shenzhen-Hong Kong Express Rail Link. (Xinhua/Lu Ye)

Photo taken on Sept. 23, 2019 shows the West Kowloon Station in Hong Kong, south China. Monday marked the first anniversary of the launch of Hong Kong section of Guangzhou-Shenzhen-Hong Kong Express Rail Link. (Xinhua/Lu Ye)

Passengers depart from West Kowloon Station in Hong Kong, south China, Sept. 23, 2019. Monday marked the first anniversary of the launch of Hong Kong section of Guangzhou-Shenzhen-Hong Kong Express Rail Link. (Xinhua/Lu Ye)

Passengers get tickets from self-service machines at West Kowloon Station in Hong Kong, south China, Sept. 23, 2019. Monday marked the first anniversary of the launch of Hong Kong section of Guangzhou-Shenzhen-Hong Kong Express Rail Link. (Xinhua/Lu Ye)