In the process of scheme research of the new second line of the Baoji-Zhongwei Railway,the analysis and comparison were carried out in combination with relevant issues of the Pingliangnan-Guyuan section,such as the topography and landform,economy and transport capacity,locomotive engine traction tonnage,braking performance,project setup,project investment,operating expense,engine purchase cost and so on,in the hope of confirming a recommendation scheme of limiting gradient.After analysis focusing on project setup and project investment,it was found that the scheme of 13‰double-engine gradient could give the shortest main tunnel length with less investment; however,after comprehensive analysis focusing on transportation characteristics of Xiping Railway,it was found that the scheme of 6/13‰ single-engine equilibrium gradient could get a obvious superiority of high transport efficiency and lower operation cost.As a result,the scheme of 6/13‰ single-engine equilibrium gradient which has been recommended is regarded as a technical innovation on route selection in this project.%结合宝中线增建第二线平凉南至固原段地形地貌、经济运量、机车牵引质量、制动性能、工程设置及投资、运营费和机车购置费等方面进行分析、比选,确定推荐的限制坡度方案.从工程设置及投资分析,13‰双机坡方案主隧道长度较短、工程投资较节省；统筹西平线运输特点综合分析,6/13‰单机均衡坡方案具有运输效率高,运营成本最低的明显优势.推荐6/13‰单机均衡坡方案是本项目选线的创新.
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