锦州电务段管内的沟海线是一段单线铁路,在进行电气化改造时,因设计速度要达到160km/h,需对既有道口的接近报警距离进行延长,故需将既有区间道口一侧的闭路匣装置移到站内,如图1所示。由于站内调车作业等原因使机车压入闭路匣的机会较多,如单纯采用闭路匣就会造成道口误报警,为 Jinzhou electricity segment pipe trench line is a section of single-line railway, in the electrification, due to the design speed to reach 160km / h, the existing crossing need to be extended near the alarm, it is necessary to existing section of the side of the crossing Closed box device moved to the station, as shown in Figure 1. As the station shunting operations and other reasons make the locomotive into the closed box more chances, such as the use of closed box alone will lead to false alarms crossing,