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Track CircuitTrack CircuitComposition and Working Principle of Track CircuitTrack CircuitSignalRelayInsulated jointRail trackInsulated jointBeijing North Railway StationBeijing Railway StationBeijing South Railway StationTrack CircuitRelayLoss of currentComposition and Working Principle of Track CircuitTrack CircuitFunction of track circuitAxle counterRelayRailTrainAxle sensorTrackside axle counting boxMain unit of axle counterTrack CircuitCounting probe 1Counting probe 2Counting sectionReset inputCounting statusInstruct of track unoccupancyAxle counter