Variety of rail defects and long-term of external force will cause the phenomenon of rail fracture. There are two common reasons which will causes railbreak.
在轨道交通中，钢轨由于自身材质的缺陷以及长期受到各种外力复合作用会使得钢轨发生折断现象。
2
The article briefly introduces research and development process of the new type railbreak down emergent protector, its design concepts, calculating method and experiment measures.
文章简要叙述了铁路工务部件新型钢轨急救保护器的研制过程，以及设计思想、计算方法和实验手段。
3
Passenger Dedicated Line (PDL) is a fast, safe, comfortable, low power, high-capacity new mode of transport, it break the competitive pattern among traditional air, road, rail transport modes.