What does activating the passenger emergency handle unit do?

Activating the passenger emergency handle unit is designed specifically to engage the emergency braking system of the train. This function allows passengers to intervene in situations where an emergency arises, providing a critical safety mechanism to halt the train as quickly as needed.

In hazardous scenarios, such as a medical emergency or if a passenger feels unsafe, this feature ensures that immediate action can be taken by simply pulling the emergency handle. The engagement of the emergency brakes not only assists in stopping the train but also triggers protocols for ensuring passenger safety and assessing the situation.

The other functions offered by the choices do not reflect the purpose of the emergency handle. Increasing train speed would be contrary to the intent of an emergency situation, which typically requires slowing down or stopping. Activating the train lights and locking the train doors serve different safety and operational functions that do not directly relate to the immediate response needed in an emergency situation.