Abstract: Railway signal circuits are used to control signal equipment to ensure driving safety and improve transportation efficiency with safety and reliability. However, in the actual use of relay circuit equipment, it is possible that the circuits fail to respond in a safe manner in the event of failure. This paper analyzes the potential unsafe factors in signal circuit design, conducts research and fault hypotheses, analyzes the risk factors of circuit design, eliminates loopholes and hidden dangers through checking and benchmarking, prevents problems before they occur, and ensures that the signal circuit design conforms to the "fail-safe" principle. 

Key words: railway, signal, circuit, safety

摘要： 铁路信号电路用于控制信号设备保证行车安全和提高运输效率，具有安全性和可靠性。继电电路设备在实际运用中，也存在发生故障不导向安全的可能性。结合信号电路设计中潜在的不安全因素，进行研究和故障假设，分析电路设计的风险因素，通过查规对标排除漏洞和隐患，防患于未然，确保信号电路设计符合“故障-安全”原则。

关键词: 铁路, 信号, 电路, 安全