列车实际占用轨道的时间差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 ">轨道电路时间记录在信任对于事件（请参阅信任）。
