道岔标志器
/ˈswɪtʃ ˈsɪɡnəl/
n
English: switch signal · 道岔标志器
English · switch signalEspañol · señal de posición de la agujaFrançais · signal de position d’aiguille
释义：Device with an arm that is controlled by the switch stand; it is raised or lowered to indicate whether the switch is open or closed.