What occurs when determining train delocalization?

Determining train delocalization is a critical aspect of train operation safety, specifically regarding the loss of precise position tracking. When a train becomes delocalized, it means that it can no longer accurately determine its location within the railway system, which is essential for safe operations.

In this scenario, the correct choice relates to the automatic safety measures in place to mitigate the risks associated with this loss of localization. Specifically, when delocalization occurs, the train initiates emergency braking. This is a necessary safety protocol designed to prevent potential accidents that could arise from the train being unable to track its position accurately. The emergency braking system engages to stop the train as quickly and safely as possible, thereby ensuring the safety of both the passengers and the train infrastructure.

Additionally, during this process, the system may also lose stationing numbers, meaning that the train's ability to communicate its exact location is compromised. This emphasizes the importance of emergency braking in maintaining safety when the operational integrity of train positioning is at risk.