Aerial photo taken on Dec. 5, 2021 shows a bullet train pulling in at the Shandan Horse Ranch Railway Station of the Lanzhou-Xinjiang Railway in Shandan County, Zhangye City, northwest China's Gansu Province.Photo:Xinhua

Aerial photo taken on June 19, 2021 shows horses galloping at the Shandan Horse Ranch in Shandan County, Zhangye City, northwest China's Gansu Province.Photo:Xinhua

A passenger has his ticket checked as he enters the Shandan Horse Ranch Railway Station of the Lanzhou-Xinjiang Railway in Shandan County, Zhangye City, northwest China's Gansu Province, Dec. 5, 2021.Photo:Xinhua

A bullet train pulls in at the Shandan Horse Ranch Railway Station of the Lanzhou-Xinjiang Railway in Shandan County, Zhangye City, northwest China's Gansu Province, Dec. 5, 2021.Photo:Xinhua

A bullet train pulls over at the Shandan Horse Ranch Railway Station of the Lanzhou-Xinjiang Railway in Shandan County, Zhangye City, northwest China's Gansu Province, Dec. 5, 2021.Photo:Xinhua

A bullet train pulls in at the Shandan Horse Ranch Railway Station of the Lanzhou-Xinjiang Railway in Shandan County, Zhangye City, northwest China's Gansu Province, Dec. 5, 2021.Photo:Xinhua