What system is activated in case of a severe fault or emergency?

The automatic braking system is designed to enhance safety by activating the brakes without any manual intervention in the event of a severe fault or emergency. This system is critically important for the protection of both the train crew and the passengers, and it operates based on predetermined thresholds that detect anomalies such as excessive speed or malfunctioning systems.

In emergencies, this automated response helps to bring the train to a halt quickly and safely, thus minimizing the risk of accidents. The automatic braking system is typically redundant and incorporates multiple fail-safes that ensure it can function correctly under various conditions. By activating automatically during emergencies, it takes the burden off the operator, allowing them to focus on other critical tasks such as responding to the situation or communicating with control centers.

The other options present alternative systems or mechanisms that are not primarily designed for immediate emergency stop situations. The throttle override mechanism typically allows operators to regain or adjust control, which may not effectively address a severe emergency scenario. Manual control activation emphasizes human intervention, which may not be timely or efficient in emergencies. Lastly, the backup power supply is essential for maintaining system operations but does not directly engage in stopping the train in critical situations.