国外铁路为使道岔或渡线与区间线路容许速度相适应,满足行车安全,平稳和旅行舒适,试铺了多种型式的高速道岔和渡线,并拟进一步制订道岔设计和制造的技术标准。国际铁路联盟研究试验所的D121专题委员会各成员国,如法国、西德、英国、意大利、比利时、瑞士、荷兰等国铁路,在这方面做了大量工作。此外,日本、美国、 In order to adapt the turnout or crossing line to the allowable speed of the section line, the foreign railway meets the requirements of traffic safety, stability and travel comfort. Various types of high-speed turnouts and crossover lines have been tested. Further technical standards for the design and manufacture of turnouts are proposed. The member states of the D121 thematic committee of the International Union of Railways Research Laboratory, such as France, West Germany, Britain, Italy, Belgium, Switzerland and the Netherlands, have done a great deal of work in this regard. In addition, Japan, the United States,