Analysis of Signal System Availability in the Case of Position Loss for Fully-Automatic Train Operating Mode Trains

The development of unmanned driving technology in subways has improved operational efficiency and safety, but the problem of lost train positioning poses a challenge to the availability of signal systems. This article deeply analyzes the reasons for the loss of train positioning in the scenario of unmanned subway driving, the impact on key functions of the signal system, evaluates the availability of the signal system, and proposes strategies to improve its availability. The aim is to provide theoretical support and practical reference for ensuring the safe and efficient operation of the subway, and to help the urban rail transit system become more intelligent, safe, and reliable.