The story takes place after the founding of the People's Republic of China. Young technician Chang Hanqing and war hero Jin Canlan devote their lives to the development of China's electric locomotive industry.
In the year 1960, Chang Hanqing (Tong Dawei) has just returned from studies abroad. He crosses paths with Jin Canlan (Jiang Xin) who has transferred from being part of the railway army to work in the factory. Unable to see eye to eye at first, a relationship of mutual understanding and love slowly blossoms between them. As they got married, the two worked together to overcome many difficulties as they continue to pour their efforts into research and development that will eventually shape the Chinese electric locomotive industry.