What indicates a potential issue with the train’s braking system?

The illumination of the Critical Defect light is a clear indication of a significant issue within the train’s braking system. This light serves as an alert for defects that could potentially compromise the safety and functionality of the braking system, which is critical for the overall operation of the train. When this light activates, it generally indicates that the system has detected a fault that requires immediate attention, signaling operators to take necessary actions such as performing diagnostics or servicing the braking components to ensure safe operation.

In contrast, while the General Fault light could signify various issues, it is less specific than the Critical Defect light and may not directly correlate with a critical failure in the braking system. The Maintenance Fault light, although it indicates a fault, suggests a less severe problem that typically pertains to routine maintenance needs rather than immediate safety issues. The SIV status light being green usually indicates normal operation of the Static Inverter, but it does not provide any relevant information about the braking system and its performance. Hence, the activation of the Critical Defect light is the most direct and urgent indicator of a potential issue with the train’s braking system.