What happens after an emergency switch is activated at the end of the train?

When an emergency switch is activated at the end of the train, one of the immediate responses is to trigger a system notification or alert. In this case, the display will show the message "EMERGENCY." This notification is crucial as it informs the crew and other personnel of the emergency situation, enabling them to take the necessary steps to ensure safety and address the issue.

The display of an emergency message serves multiple purposes. It ensures that all relevant parties are aware of the situation, allowing for quick coordination of responses. Additionally, it can activate other safety measures to help mitigate risks associated with the emergency.

The other options provided do not accurately represent the immediate and standardized response to activating the emergency switch. For instance, the system does not automatically shut down the train, nor is there a requirement for the train to come to a complete stop before the emergency switch is activated. Hand brakes are also not released as a result of engaging the emergency switch; rather, such an action is typically contradictory to the need for immediate control during an emergency event.