Aerial photo taken on January 8, 2020 shows high speed trains after maintaining in Guiyang, capital of Southwest China's Guizhou province. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)

Working staff maintain high speed trains in Guiyang, capital of southwest China's Guizhou Province, January 8, 2020. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)

Working staff maintain high speed trains in Guiyang, capital of southwest China's Guizhou Province, January 8, 2020. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)

Working staff maintain high speed trains in Guiyang, capital of southwest China's Guizhou Province, January 8, 2020. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)

Working staff maintain high speed trains in Guiyang, capital of southwest China's Guizhou Province, January 8, 2020. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)

Working staff maintain high speed trains in Guiyang, capital of southwest China's Guizhou Province, January 8, 2020. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)

Aerial photo taken on January 8, 2020 shows high speed trains after maintaining in Guiyang, capital of Southwest China's Guizhou province. The 2020 Spring Festival travel rush, known as Chunyun, will start on January 10. (Photo: China News Service/Zhai Honglun)