Addressing the safety and reliability issues of the car arrester brake device in the mine incline transportation system, this study introduces a novel design for a level-track lock. The research begins with a systematic analysis of the existing car arrester mechanism, followed by a detailed presentation of the new lock's design philosophy, structure, and potential failure modes. A fault tree analysis model was constructed to qualitatively and quantitatively assess the potential causes of system failure, utilizing minimal cut sets to predict the root causes of failure. Additionally, computations of probability importance and criticality importance provide quantitative measures for the significance of failure causes.The experimental results show that the newly designed flat track locking device significantly improves the braking safety and operational stability of the inclined shaft lifting container. It not only effectively improves the material transportation efficiency, but also further strengthens the reliability of the locking device with the help of fault quantification indicators.The findings contribute substantive technical support for enhancing the safety level of the incline transportation system and offer theoretical foundations for the design and optimization of related safety equipment.