What is the operational mechanism of automated engine bay fire suppression systems installed in Class III coaches under UNECE Regulation No 107?

1. A pressurized detection tube or thermal sensors rupture/trigger upon detecting excessive engine bay temperatures (>180°C) or flames, automatically discharging aerosol, powder, or water-mist suppressant directly over high-risk engine components while sounding a dashboard alarm
2. The system dumps 500 liters of diesel fuel onto the exhaust manifold
3. The system locks all passenger windows shut
4. The system deploys parachutes from the rear roof spoiler