Concerning the wireless train protection device, its receiver alone is equipped on trains, and the transmitter is carried by an officer in charge of railway maintenance so that, when damage is inflicted on railways, for example, during railway maintenance work, the officer can stop the trains not equipped with ATC, for example, for the reason that the security method has been changed.
列車防護無線装置は車両には受信機のみが装備され、発信器は保線作業中に線路を支障させた場合、保安方式変更などでATCを使用してない列車を停止するため保線係員が携帯している。