Sensor mounted on the outside of the rails of a track to detect the increased radiated heat emitted by a defective axle box or bearing.
" class="glossaryLink ">热轴箱探测器:一个A beam spanning the track, which is used to support the rails. Originally wooden but concrete sleepers are generally used now. Steel sleepers have also been used occasionally
" class="glossaryLink ">卧铺安装的温度探测器，它警告aThe control centre for signalling trains. This is where the signallers control the movements of trains by signals.
" class="glossaryLink ">信号箱一个过热的轴承，因为它计算通过的车轮。它能显示出哪个轴有故障，以及哪个轴或车轮比火车上的其他轴或车轮更热。
