What is the purpose of the signal if an operator sees a train stopping unexpectedly?

The purpose of the signal when an operator sees a train stopping unexpectedly is to maintain a safe distance. This is crucial for ensuring the safety of both the operator and the passengers, as well as any trains or vehicles that may be nearby. By maintaining a safe distance, the operator can minimize the risk of collisions or accidents, especially in scenarios where the train may have stopped due to an emergency or malfunction.

This principle emphasizes the importance of situational awareness for train operators, enabling them to respond effectively to unexpected halts by signaling to others that they should keep a safe space. This proactive measure is a fundamental part of railway safety protocols, ensuring that all personnel can manage any emergency with the appropriate caution and care.