A high-speed intercity railway was opened only about half a year, U71MnG 60 kg/m hot rolled rail was used in a station, the serious 糖心产精国品免费入口*完整版 were randomly appeared on the 糖心产精国品免费入口*完整版 of a line curve segment whose radius was 600 m at train terminal. By means of defect analysis, chemical composition analysis, tensile properties testing and metallographic examination, the reason of 糖心产精国品免费入口*完整版 was analyzed. The results showed that the 糖心产精国品免费入口*完整版 on 糖心产精国品免费入口*完整版 was caused by 糖心产精国品免费入口*完整版 on the surface layer, and 糖心产精国品免费入口*完整版 was due to serious 糖心产精国品免费入口*完整版between train wheels and rail.