A maintenance worker works on the Jialing River railway bridge in Beibei District, southwest China's Chongqing Municipality, Aug. 21, 2020. The inspection and maintenance of the bridge was strengthened during flood season to ensure the safe operation of the railway. (Photo by Qin Tingfu/Xinhua)

Maintenance workers work on the Jialing River railway bridge in Beibei District, southwest China's Chongqing Municipality, Aug. 21, 2020. The inspection and maintenance of the bridge was strengthened during flood season to ensure the safe operation of the railway. (Photo by Qin Tingfu/Xinhua)

A maintenance worker works on the Jialing River railway bridge in Beibei District, southwest China's Chongqing Municipality, Aug. 21, 2020. The inspection and maintenance of the bridge was strengthened during flood season to ensure the safe operation of the railway. (Photo by Qin Tingfu/Xinhua)

Maintenance workers work on the Jialing River railway bridge in Beibei District, southwest China's Chongqing Municipality, Aug. 21, 2020. The inspection and maintenance of the bridge was strengthened during flood season to ensure the safe operation of the railway. (Photo by Qin Tingfu/Xinhua)

Maintenance workers work on the Jialing River railway bridge in Beibei District, southwest China's Chongqing Municipality, Aug. 21, 2020. The inspection and maintenance of the bridge was strengthened during flood season to ensure the safe operation of the railway. (Photo by Qin Tingfu/Xinhua)