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目前,上道使用的区间自动闭塞,仅限于检查区段是否空闲和通过信号机信号显示间的联系是否正确。但当闭塞区段轨道电路因故失去分路作用后,则会出现有车占用时误认为该区段空闲,从而使信号显示升级。曾因此导致多起列车追尾等恶性事故的发生。为提高自动闭塞的安全性和可靠?
At present, the automatic blocking of the interval used on the road is limited to checking whether the section is free and whether the connection between the signals displayed through the signal is correct. However, when the occluded track circuit lost its shunting function for some reason, it would appear that when the car is in use, it mistakenly believes that the section is idle, so that the signal display is upgraded. Once caused many train rear-end accidents and so on. To improve the safety and reliability of automatic occlusion?