If a car activates a detector but is found without defects, what must happen if it activates the next detector?

When a car activates a detector and is determined to be defect-free, but then activates the next detector, it indicates the potential for a recurring issue or undetected problem. In this situation, the appropriate and safe action is to set the car out of service for further inspection.

By setting the car out, it allows for a detailed examination to ensure that there are no hidden defects or issues that the initial inspection may not have caught. This procedure is critical for maintaining safety and operational integrity on the railways. Ensuring the car does not continue on its journey helps prevent potential hazards that could arise from a malfunctioning car, protecting both the train crew and the infrastructure.

Continuing without stopping could lead to increased risks, and notifying the dispatcher is typically part of setting the car out, rather than a standalone action. Inspecting only one side of the train does not provide a comprehensive check and may overlook critical issues that could affect safety. Therefore, taking the step to set the car out is the correct and responsible course of action in this scenario.