在信号机点灯电路中，灯丝继电器只检查点灯灯丝的情况，不检查另外一个灯的情况。
A filament relay only checks the status of the lighting filament in the circuit route of lighting railway signal, not checks the status of another one.
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.
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