What happens to train speed in Release mode once it exceeds 12 mph?

In Release mode, when a train exceeds a speed of 12 mph, the system automatically applies the service brakes. This action is designed to ensure that the train's speed is reduced to a safe level, specifically down to 9 mph. The rationale behind this automatic braking system is to enhance safety and control over the train's operation, particularly in situations where exceeding a designated speed could lead to potential hazards.

Automatic braking serves as a crucial safety mechanism, especially in situations where manual intervention may not occur swiftly enough to prevent unsafe speeding conditions. By managing the speed in this manner, the system helps maintain operational standards and ensures the safety of both the train and its passengers.

Other options do not accurately reflect the functionalities of Release mode. For instance, the idea that the train would continue to accelerate further contradicts the purpose of the safety brakes. The notion that the train must come to a complete stop is overly extreme and not a requirement of the operational procedure, while maintaining speed without a command to change ignores the necessary safety protocols in place for managing excessive speed.