What happens when the Safety loop circuit fails?

When the safety loop circuit fails, engaging the emergency brakes is a critical response to ensure the safety of the train and its passengers. The safety loop is a system designed to monitor and control essential safety functions. If a failure is detected in this loop, it indicates that there could be a potential risk or malfunction that might compromise the safe operation of the train.

The engagement of emergency brakes immediately reacts to the failure, bringing the train to a stop in a controlled manner, preventing accidents and ensuring that any dangerous situations can be assessed before normal operations continue. This response is essential as it prioritizes safety above all else in the event of a fault.

In contrast, if the system were to operate under normal conditions despite a safety loop failure or restore normal operations quickly, it could lead to severe safety risks, including potential accidents or injury, which is why the correct action is to engage the emergency brakes.