Story about workers in the Changxindian railway factory in southwest Beijing. Early years of the Republic of China - Kang Ben Shan, Wang Ran Qiu, Wan Cheng Shun and others are Changxin who grew up in the bottom "mouth" and "seam" of the ancient town of Changxindian in southwest Beijing. Shop railway factory workers, they dream of “being great craftsmen, repairing the most difficult machines, and building the best trains”. Under the leadership of the party, they united the workers to fight together, set up workers' clubs, protected technical backbones, resisted Japanese aggression, arrested Kuomintang agents, etc., dedicated all their efforts in the historical process of national independence, national prosperity, and industrial rise. (Source: Douban)