This article,with the help of the friction mechanics theory,has analyzed rail scratch and the cause,mechanism and harm of its derivative harms and proposed some renovation measures concerning it.

Taking Houyue-line as a example,this paper analyses some factors of wheel burn caused by wheel slip when towed by heavy-haul locomotive in mountainous area.

An analysis of rail failure in sharp cuves ofmountainous railway;

This paper analyzes the rail failure on concrete sleeper rail track referring to the stress of the rail.

With the increase of the operation times in Shanghai Metro,the rail damage has become one of the most important factors which directly affect the safety of the line.

According to the statistics of the general style of rail damage and the damage actuality in Beijing metro, it could be concluded that due to its longer operation period the rail damage style of line 1 and 2 was mainly rail fatigue, while the damage on line 13 and Batong line was mainly at weld bonds.

The paper analyzes the types and macro characteristics of rail damages on Guangzhou Metro Line 2 according to practical investigation and statistics incorporating existing line conditions,divides the rail damages into three stages from macro-characteristics and formation mechanism,discusses the main features of every damage stage,and briefly analyzes the causes of rail damages.