【摘要】 介绍了复线铁路线型几何设计的方法和平、纵面整体优化设计的方法，从理论上证明了铁路线路平、纵断面整体优化设计可以分为两步：纵断面优化和平面优化，这两步交替运行就可得到最优解。更多还原

【Abstract】 This paper introduces the method of alignment geometrical design and the method of overall optimization design for double track railway ,presents a theoretic proof that the railway alignment overall optimization design may be devided into two stages.The first stage is the vertical profile optimization and the other is the plan optimization.Using both stages alternately,we can get the optimization result successfully.更多还原