1978年，大连开往三棵树的列车上，年轻乘警汪新第一次执勤就在抓捕行动中负伤，却因祸得福结识了铁路公安老刑警马魁，二人结为师徒，并肩战斗在铁路公安第一线。在这条铁路线上，40年间，他们经历了蒸汽机车、电力机车、动车高铁时代，见证了祖国的伟大成就和人民生活的巨大变化。汪新、马魁为代表的一线铁路公安干警，反扒、打拐、缉毒、巡线、守护、打击盗抢骗、扫黑除恶，几十年如一日破大案、解决小案、给旅客送温暖、共和谐。为了保卫人民生命财产安全，铁路公安干警甚至牺牲了宝贵的生命。列车上来来往往的旅客，带着各个时期不同的印记，展示了人情冷暖、人生百态。新老两代干警也在自己的人生经历中得到了境界的升华，忠诚警魂、薪火相传。
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