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我国的铁路区间信号设备采用集中放置于室内的形式，这对系统的维护和维修提供了很大的方便。为了提高系统可靠性，节省投资，采用Ｎ＋ １ 热备方式。本文从可靠性理论出发，详细分析并计算了Ｎ＋ １热备方式下系统的可靠性指标。
China’s railway signal equipment used in a centralized manner placed in the indoor form, which provides great convenience for system maintenance and repair. In order to improve system reliability and save investment, adopt N + 1 hot backup mode. Based on the reliability theory, this paper analyzes and calculates the reliability index of the system under N + 1 hot backup mode in detail.