Railway location is the foundation work for comprehensive railway design, which requires overall planning, all-round consideration, sound adaptation to local conditions and reasonable choices because of its broad involvement. Across Hunan, Guangxi and Guangdong provinces, Luoyang-Zhanjiang Railway passes through diverse geomorphic units such as low mountains and hills, karst isolated peaks and plains. Adverse geological conditions and special rock and soil are widely distributed along the line. In this paper, by studying the minimum curve radius, maximum grade, reasonable plan and profile standards applicable to the topographic and geologic conditions along the line, the author carried out a wide range of comparison of locations over mountain in the reservoir area which achieved good route selection effects, proposed essential principles of route selection according to the characteristics of the karst regions, and made a successful trial on how to improve engineering geologic location of line in landslide area, which provided valuable experience and lesson for railway location in such topographic and geological conditions.%铁路选线是铁路设计综合性的基础工作，涉及面广，必须统筹兼顾，因地制宜及合理取舍。洛湛铁路经过湘、桂、粤三省区，线路经过低山、丘陵、岩溶孤峰及平原等不同的地貌单元。沿线不良地质和特殊岩土广泛分布，本文通过研究适应沿线地形地质条件的最小曲线半径、最大坡度，对水库地区线路越岭方案进行了大范围的比较，取得了良好的选线效果；根据岩溶地区特点提出了基本的选线原则；对如何加强滑坡地区工程地质选线进行了成功的尝试，为在此类地形、地质条件下的铁路选线提供可以借鉴的经验和教训。
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