信号箱中使用的电动指示装置。该仪器与相邻信号箱内的类似装置相连，并可设置为指示The section of line between the section signal of one signalbox and the home signal of the next signalbox ahead
" class="glossaryLink ">块段两个信号箱之间是占用乘火车。
信号箱中使用的电动指示装置。该仪器与相邻信号箱内的类似装置相连，并可设置为指示The section of line between the section signal of one signalbox and the home signal of the next signalbox ahead
" class="glossaryLink ">块段两个信号箱之间是占用乘火车。
