Passengers walk to take trains at Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand. (Photos: Xinhua)

Passengers queue at the waiting room of Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers walk to take trains at Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers walk to take trains at Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers queue to take trains at Nanjing Railway Station in east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers queue at the waiting room of Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers queue to buy tickets at Nanjing Railway Station in east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers wait to take trains at Changzhou Railway Station in east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.

Passengers walk to take trains at Nanjing Railway Station in east China's Jiangsu Province, April 30, 2019. Railway stations witness a travel rush as the May Day holiday is on hand.