Passengers board the train at Changsha railway station in Central China's Hunan province, May 4, 2019. Changsha railway system witnesses a travel rush as the Labor Day holiday comes to an end. [Photo/Xinhua]

Passengers buy tickets at Changsha railway station in Central China's Hunan province, May 4, 2019. Changsha railway system witnesses a travel rush as the Labor Day holiday comes to an end. [Photo/Xinhua]

Passengers go through ticket check at Changsha railway station in Central China's Hunan province, May 4, 2019. Changsha railway system witnesses a travel rush as the Labor Day holiday comes to an end. [Photo/Xinhua]

Passengers go through ticket check at Fuzhou railway station in Southeast China's Fujian province, May 4, 2019. Fuzhou railway system witnesses a travel rush as the Labor Day holiday comes to an end. [Photo/Xinhua]

Passengers take the escalator at Fuzhou railway station in Southeast China's Fujian province, May 4, 2019. Fuzhou railway system witnesses a travel rush as the Labor Day holiday comes to an end. [Photo/Xinhua]

Passengers arrive at Fuzhou railway station in Southeast China's Fujian province, May 4, 2019. Fuzhou railway system witnesses a travel rush as the Labor Day holiday comes to an end. [Photo/Xinhua]