At last this paper summarizes research methods of main line parameters of High-speed railway, such as the minimum radius of horizontal curves, length and alignment of transition curves.
总结了现行的高速铁路主要设计参数的研究方法，如最小圆曲线半径、缓和曲线线形及长度、竖曲线半径等参数的确定原则和方法。
The result could act as reference in the route alignment optimal selection and make for realizing harmonious development between railway construction and surrounding environment.
所得结论应用到铁路线路的方案比选过程中，有助于选择出对环境噪声影响“最小”的方案，实现铁路建设和环境保护相协调的目标。
Sleeve axis is always perpendicular to railway sleepers, ensuring quick and accurate alignment. The average working efficiency is 1.5 times that of double end wrench.
套筒轴线始终垂直于轨枕面，对位快速、准确，平均工作效率为双头的1.5倍。
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