一、前言列车在道俞转辙器前端导致脱轨的原因主要有:尖轨、基本轨、车轮轮缘的磨耗和伤损;尖轨尖端的密贴状态(尖端开口)。其中,尖轨尖端夹带异物时,可以由信号防护设备确保安全。可是,同向道岔由于基本轨是曲线的外轨,所以必须对有关部件的磨耗 I. INTRODUCTION The main causes of the derailment caused by the train at the front of the switch are: wear and damage of the sharp rail, the basic rail and the wheel flange; and the close contact state of the sharp rail (tip opening). Among them, the tip of the track when the foreign body, you can signal safety equipment to ensure safety. However, with the same turnout basic rail is the outer curve of the curve, it must be worn on the parts