短語詞組短語railway fsk signal 車載fsk信號railway digital signal cable 鉄路數(shù)字信號電纜Railway communication signal 鉄道通信信號railway y signal 鉄路信號railway station signal equipment 車站信號設(shè)備railway fire signal 鉄路火警信號railway station signal equipments 鉄路車站信號設(shè)備railway cab signal 機(jī)車信號 返回 railway signal