铁路信号技术正在进入意义深远的迅速变革时期。它既反映出影响主要铁路公司的体制改变，又与久已预期的从航空航天和国防工业派生的先进技术有关。从一个地点对大范围的线路进行信号控制的能力，现被认为是不成问题了，而利用信息公路（光纤和无线电）传送非安全和安全数据现 Railway signaling technology is entering a period of rapid change of far-reaching significance. It reflects both the institutional changes affecting the major railway companies and the long-awaited advancement of technologies derived from the aerospace and defense industries. The ability to signal a wide range of routes from one location is now considered to be unchallenged, while the use of information highways (fiber and radio) to transmit non-secure and secure data