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７５ｋｇ／ｍ钢轨用道岔三项科研成果通过铁道部技术鉴定国家重大装备科技攻关项目《７５ｋｇ／ｍ钢轨１２号单开道岔》、（７５ｋｇ／ｍ钢轨１８号单开道岔》、《７５ｋｇ／ｍ钢轨１２号复式交分道岔》，由铁道部专业设计院进行研究设计，山海关桥梁厂进行试制，北京局在...
75kg / m rail turnout three scientific research achievements through the Ministry of Railways technology appraisal of major national equipment scientific and technological project “75kg / m rail 12 single turnout” (75kg / m rail 18 single turnout “,” 75kg / m rail 12 Compound turnout turnout ", by the Ministry of Railways Professional Design Institute for research and design, Shanhaiguan Bridge Factory trial production, the Beijing Bureau in ...