短語詞組短語railway fsk signal 車載fsk信號railway digital signal cable 鐵路數(shù)字信號電纜Railway communication signal 鐵道通信信號railway y signal 鐵路信號railway station signal equipment 車站信號設備railway fire signal 鐵路火警信號railway station signal equipments 鐵路車站信號設備railway cab signal 機車信號 返回 railway signal