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为了解决铁路与公路平交道口的安全防护,改善道口值班人员的劳动条件和发展无人看守道口自动信号,在北京铁路局、北京分局领导和有关部门的关怀和支持下,1975年3月成立了由天津工程学校、天津电务段、路局科研所组成的三结合道口信号试验小组,共同研究,试制了低耗电通用式道口自动信号,并由石家庄铁一中及石家庄运输学校研制了锌一空电池,已装在天津三线王串场新村道口试用。低耗电通用式道口自动信号设备,适用于自动闭塞,非自动闭塞
In order to solve the railway and highway crossing safety protection, improve the working conditions of crossing the duty on duty and the development of unattended crossing automatic signal, with the care and support of the Beijing Railway Bureau, Beijing Branch and the relevant departments, established in March 1975 Tianjin TEDA, the Road Bureau of scientific research institute composed of three combination of crossing signal test group to jointly study and trial production of low-power universal crossings automatic signal, and by the Shijiazhuang Railway and Shijiazhuang Transportation School developed Zinc a battery, has been installed in Tianjin Sanchunchang Village Village Road trial. Low-power universal crossings automatic signal equipment for automatic blocking, non-automatic blocking