Mechanics work at a train maintenance workshop in Hefei, east China's Anhui Province, Oct. 6, 2020. Railway staff members have stepped up the maintenance of high-speed trains to ensure traffic safety as the National Day and Mid-Autumn Festival holidays are driving up travel demand. (Xinhua/Huang Bohan)

A mechanic works at a train maintenance workshop in Hefei, east China's Anhui Province, Oct. 6, 2020. Railway staff members have stepped up the maintenance of high-speed trains to ensure traffic safety as the National Day and Mid-Autumn Festival holidays are driving up travel demand. (Xinhua/Huang Bohan)

A mechanic works at a train maintenance workshop in Hefei, east China's Anhui Province, Oct. 6, 2020. Railway staff members have stepped up the maintenance of high-speed trains to ensure traffic safety as the National Day and Mid-Autumn Festival holidays are driving up travel demand. (Xinhua/Huang Bohan)

A mechanic works at a train maintenance workshop in Hefei, east China's Anhui Province, Oct. 6, 2020. Railway staff members have stepped up the maintenance of high-speed trains to ensure traffic safety as the National Day and Mid-Autumn Festival holidays are driving up travel demand. (Xinhua/Huang Bohan)

A mechanic checks the inside of a train at a train maintenance workshop in Hefei, east China's Anhui Province, Oct. 6, 2020. Railway staff members have stepped up the maintenance of high-speed trains to ensure traffic safety as the National Day and Mid-Autumn Festival holidays are driving up travel demand. (Xinhua/Huang Bohan)

Mechanics work at a train maintenance workshop in Hefei, east China's Anhui Province, Oct. 6, 2020. Railway staff members have stepped up the maintenance of high-speed trains to ensure traffic safety as the National Day and Mid-Autumn Festival holidays are driving up travel demand. (Xinhua/Huang Bohan)