无缝线路是本世纪铁路上最大技术改革成就之一,经济效果显著。全世界已铺设约0.4Mkm,我国已铺约14,000km,遍及各主要干线。但至今仍有胀轨跑道问题。一旦发生此类事故,往往使列车脱线颠覆,危害十分严重。虽在各种规章制度中作了种种防范措施,仍有发生。现拟利用无缝线路特性,在胀轨跑道之前,线路方向有异常的预兆,如作适当监 The seamless line is one of the achievements of the largest technological reform on the railway in this century, with remarkable economic results. The world has laid about 0.4Mkm, China has been about 14,000km, covering all major routes. However, there are still problems with the expansion track. In the event of such an accident, the train is often subverted off-line, the damage is very serious. Although a variety of rules and regulations in a variety of preventive measures, still occur. It is proposed to make use of the characteristics of the seamless line. Before the expansion track is runway, the direction of the line has an unusual omen,