Railway train operation control system with redundancy diagnosis circuit and control method

The invention discloses a railway train operation control system with a redundancy diagnosis circuit and a control method, and belongs to the technical field of train control. The control system comprises a communication interface device which comprises a communication unit A and a communication unit B. The communication unit A and the communication unit B are arranged in a redundancy mode through a redundancy diagnosis circuit unit. The redundancy diagnosis circuit unit comprises a communication unit A diagnosis circuit and a communication unit B diagnosis circuit, and comprises a self-diagnosis circuit and a redundancy detection circuit; the self-diagnosis circuit comprises a fault logic judgment circuit and a phase discrimination safety door driving circuit; the control method comprises the following steps: (1) the communication unit A is in a working state, and the communication unit B is in a standby state; a, fault monitoring is carried out on the communication unit A; b, performing redundancy diagnosis