train formation signal box峰尾信号楼;列车编组信号楼

train order signal WESTBANK行车命令号志

train air signal valve列车号态气阀

train announcing signal列车到发通告信号

train order signal行车命令号志

train protecting signal列车防护信号

train signal detail行车信号机

train signal pipe列车信号管

train operation by signal indication按信号显示行车

signal train符号串;信号序列