What should a driver do first in the case of a fire on board the train?

In the event of a fire on board a train, turning off the HVAC (Heating, Ventilation, and Air Conditioning) turret switch is a critical initial step. This action is important because it helps to prevent the spread of smoke and flames through the ventilation system, which could potentially escalate the situation or pose a greater risk to passengers. By shutting down the HVAC system, the driver minimizes the chance of toxic smoke circulating throughout the train, thereby enhancing the safety conditions for everyone on board.

While other actions, such as alerting the conductor or using a fire extinguisher, are also vital components of an effective response to a fire, the priority must be given to controlling the environment in which the fire exists. This can significantly influence the safety and survival of passengers and crew in an emergency situation.