In the case of an emergency, what is the first response to a fire on board?

Sounding the emergency horn signal is the correct initial response to a fire on board a train. This action serves multiple critical purposes. First, it alerts both train crew and passengers to the potential danger, ensuring that everyone is aware of the situation. Second, the emergency horn signal is a way to communicate urgent information to personnel in the vicinity, such as track workers or nearby train crews, who can then assist or prepare for an emergency response.

While evacuating the train is ultimately necessary in such emergencies, it is crucial to first establish communication and ensure that help is on the way. Notifying the nearest control center typically follows the initial signal and is part of coordinating further assistance and managing the situation. Attempting to put out the fire can be dangerous, especially if the fire is significant or if the source is unknown, and should only be considered if it is safe to do so after ensuring immediate alerts are made.