Seeking to address international concerns, foreign ministry spokesman Zhao Lijian said China has been adjusting the zero-COVID policy based on the changing circumstances.
China is set to open a 2,298-km high-speed railway line, the world's longest, in about two weeks, linking the capital city with the country's trading hub of Guangzhou.
The training was expected to begin soon.
India's move to opt for Japanese bullet trains on the Mumbai-Ahmedabad route had raised concerns in China which is competing with Japan to build high-speed rail networks in India.