A staff member maintains a bullet train at a bullet train maintenance hub in Hefei, capital of East China's Anhui province, April 29, 2020. Every night, train staff members here fully maintain the bullet trains to remove hidden dangers and ensure train running security. [Photo/Xinhua]
A staff member cleans up a bullet train at a bullet train maintenance hub in Hefei, capital of East China's Anhui province, April 29, 2020. [Photo/Xinhua]
A staff member cleans up a bullet train at a bullet train maintenance hub in Hefei, capital of East China's Anhui province, April 29, 2020. [Photo/Xinhua]
A staff member cleans up a bullet train at a bullet train maintenance hub in Hefei, capital of East China's Anhui province, April 29, 2020. [Photo/Xinhua]
A staff member cleans up a bullet train at a bullet train maintenance hub in Hefei, capital of East China's Anhui province, April 29, 2020. [Photo/Xinhua]
