A maintenance staff inspects a high-speed sleeper train remotely with an intelligent car bottom robot at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

The maintenance personnel review the suspected fault location detected by the intelligent car-bottom robot during the maintenance of a high-speed sleeper train at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

A maintenance staff inspects a high-speed sleeper train at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

A high-speed sleeper train drives into a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

A maintenance staff selects tools at a intelligent tool room at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

An intelligent car-bottom robot overhauls a high-speed sleeper train at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

An automatic car washing system operates at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)

A maintenance staff inspects the cab of a high-speed sleeper train at a high-speed train depot in Shenzhen, south China's Guangdong Province, Jan. 17, 2025. Intelligent car-bottom robots, self-service car washes, intelligent tool rooms, etc., are used for the maintenance of high-speed sleeper trains in Shenzhen high-speed train depot during the Spring Festival travel rush. (Xinhua/Mao Siqian)