Students view a diesel locomotive in Jinan, east China's Shandong Province, Aug. 21, 2018. The Jinan Locomotive Depot on Tuesday promoted to primary school students knowledge of the history of Chinese modern railway development to enrich their summer vacation. (Xinhua/Zhu Zheng)

Students view a steam locomotive in Jinan, east China's Shandong Province, Aug. 21, 2018. The Jinan Locomotive Depot on Tuesday promoted to primary school students knowledge of the history of Chinese modern railway development to enrich their summer vacation. (Xinhua/Zhu Zheng)

Students get a stimulated driving experience of a bullet train in Jinan, east China's Shandong Province, Aug. 21, 2018. The Jinan Locomotive Depot on Tuesday promoted to primary school students knowledge of the history of Chinese modern railway development to enrich their summer vacation. (Xinhua/Zhu Zheng)