The test runs were carried out along the high-speed railway linking Fuzhou and Xiamen in Fujian province to gauge the performance of the trains after they had been outfitted with new technological components.

On Wednesday, test trains travelled at a speed of 453 km/h on the Meizhou Bay Bridge from opposite directions passing each other.

On Thursday, trial trains were operated at a speed of 420 km/h on the Haiwei Tunnel from opposite directions passing each other.

China has also been modifying its railway infrastructure as it works on developing faster trains. Some new high-speed railway lines have been built under higher standards that will allow more technologically advanced trains to operate at higher speeds in the future.

Currently, the fastest bullet trains in China operate at a speed of 350 km/h along several lines, including the Beijing-Shanghai High-Speed Railway, the Beijing-Tianjin High-Speed Railway, the Beijing-Zhangjiakou High-Speed Railway and the Chengdu-Chongqing High-Speed Railway.