闭塞装置 meaning in Chinese

plugging up device
plugging-up device

At this time , the absolute block system was not being used for the jijie - gejiu line
1990年当时的鸡街线，因为只有一辆蒸汽机车可以行驶的，所以就不要闭塞装置。
However , there was a block system machine in this station . and , it was maintenance everyday so that it is able to use it anytime
但是这车站有路签staff闭塞装置，该装置将在什么时候开始使用还不知道，但该装置被擦得很亮。