一个S andT术语，用于测试An electrical circuit that includes an insulated section of track. A train occupying the track will complete the circuit by connecting the two rails together via its wheels and axles thus signaling the trains occupation of that section of track. Track circuits are designed to detect the presence or absence of a train.
" class="glossaryLink ">轨道电路，其效果将是使轨道电路显示占用
