通过信号机的作用是防护自动闭塞线路上的闭塞分区或非自动闭塞线路上的所间区间，指示列车可否进入它所防护的闭塞分区或所间区间。通过信号机一般设在闭塞分区或所间区间的分界点。
通过对现有自动闭塞区间通过信号机容许信号点灯电路存在问题的分析，根据相关规范，提出解决办法。
The paper gives solutions to the problems with lighting circuit of permissive aspect of block signal of existing automatic block section according to relevant specifications.
通过对目前通过信号机灯光显示意义单一的问题分析，提出增加闪光信号的解决办法，并举例说明其实施可能性。
Through analyzing the current indication singleness of through signal, a solution to enhance flash signal was brought forward and the possibility of its implementation was illustrated with examples.
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