The most pivotal technical problem of building high-speed railway on soft soil is strictly controlling post-construction settlement of subgrade and its elastic deformation of top surface.

在软土地基上修建高速铁路，其最关键的技术问题就是严格控制路基的工后沉降及列车高速运行时路基顶面的弹性变形。

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U. S. Federal Railway Administration Research and Development Office developed a track surface and underground rock movement investigation system.

美国联邦铁路局研究开发办公室通过一项研究项目。开发出一种轨道表面及地下岩土移动勘测系统。

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ST bumper used to resist shock is a pivotal part in railway vehicle transportation. As primary load-transfer component of this part, thrust cone required very high precision and surface quality.

ST型缓冲器是铁路车辆运输过程中用于抗冲击的关键部件，推力锥作为其中的主要传力零件，其精度和表面质量要求都非常高。

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