一九七五年春天，为保证铁路正常运输，中州铁路局商洛电务段组织了以革委会主任路云志为首的设备检查整修队，决心步行二百五十公裡，在管区内的铁路沿线进行设备检修。 “四人帮”的亲信姚兴邦等，害怕路云志等人的行动打乱他们“稳住上海，搞乱全国，乱中夺权”的阴谋，便给路云志他们制造重重障碍，污蔑他们搞“唯生产力论”等等。但是，这一切都没能阻止整修队前进。姚兴邦又派人到整修队进行分化瓦解，也未得逞。继之，又妄图制造火车相撞事故。由于路云志挺身抢救，使事故得以避免。姚兴邦狗急跳牆，派他的保镖非法绑架了路云志，逼他承认步行二百五十裡是“走资派”搞的黑样板，并要他交出后台。整修队在看道工人和群众的帮助下，经过一场搏斗，救出了路云志，又克服重重困难，胜利到达了检修的终点站。
影片通过剧中剧的表现手法，展现了群主老黑克服种种困难拍摄网大电影的故事。他在演员缺乏的情况下亲自扮演主角来完成这部影片，讲述了这么一个故事：背包客老黑在外旅游遇到经费困难而向路人求助，得到一位素不相识的向日葵姑娘帮助下而回到了家乡，为了表示感谢与信守求助承诺，从而引出了一段老黑前往深圳寻找向日葵表达感恩的故事。虽然老黑最终与向日葵没有见到面，但被向日葵的大爱之心所感动，按照向日葵的要求愿意回去把爱心传递下去......
Beauty contest winner Patricia Knight's one bid for screen stardom was Columbia's Shockproof. Knight plays Jenny Wright, a convicted murderess paroled in the care of probation officer Griff Marat (Cornel Wilde). What begins as an aloof professional relationship eventually blossoms into romance. The fly in the ointment is shady Harry Wesson (John Baragrey), the gambler who inveigled Jenny into committing murder. The girl is torn between creature comforts offered her by Wesson and the promise of a clean life offered by Griff. This early Douglas Sirk effort contains a smattering of the stylistic touches which distinguished his later work.The screenplay was written by famed director Samuel Fuller, known for his gritty realism and hard-boiled style. ~ Hal Erickson, All Movie Guide
