Diesel-electric combination trains pose what specific hazard that rescuers must remain aware of?

Diesel-electric combination trains operate using both diesel engines and electric propulsion systems, which creates unique hazards for rescuers. The primary concern is the presence of high voltage, which can be 600 volts or more in the electric systems of such trains. This high voltage poses an immediate risk of electric shock to rescuers if they come into contact with live wires or components that are not properly insulated. Understanding this risk is crucial for anyone involved in vehicle rescue operations, as electric shock can lead to serious injury or fatality.

While the other options highlight important safety concerns—such as the risk of combustion from fuel leaks, potential for inadequate ventilation in confined spaces, and hazardous material spills—they do not specifically address the unique electrical hazard that diesel-electric combination trains present. Rescuers must prioritize awareness of high voltage systems and take appropriate precautions when working around these types of trains.