1) Inbound signal: mainly display L, U, UU, LU, HB, H, USU. The column control center respectively controls the tracking codes of the track circuits of the sections according to their different display states. The incoming signal machine is provided with train signal relay LXJ, guide signal relay YXJ, pass signal relay TXJ, green-yellow signal relay LUXJ, and positive line signal relay ZXJ. Under special circumstances, such as when the train control center code and the relay code are connected, the train control center judges the display state of the incoming signal by collecting the status of each signal relay, and then realizes the tracking and sending of codes in the interval track section.
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