The current colour signal lights used in railway are different colours and different combinations for different orders and commands.
现行铁路灯光信号显示是用不同颜色灯光或灯光组合给出不同的命令。
The current colour signal lights used in railway are different colours and different combinations for different orders and commands.
现行铁路灯光信号显示是用不同颜色灯光或灯光组合给出不同的命令。
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