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The locomotive fire monitoring subsystem (model Ydvs-02) is developed on the basis of the locomotive operation safety and fire monitoring system, combined with the overall requirements of the locomotive on-board safety protection system (6A system), using a 32-bit high-performance processor and incorporating special signal processing algorithms, it can provide continuous and reliable judgment of whether a fire has occurred in an environment where multiple sources of false alarms exist, provide fire monitoring information to the platform, and realize fire alarm video linkage through the physical quantities of detected smoke, heat, and light.