[deaps]

Yeah - I remember when I was a volunteer firefighter - if you parked a fire truck in an atmosphere that was filled with combustible gasses, the engine would not shut off.

The trucks were equipped with some type of an emergency throw should that situation ever arise. We never had to use it in my time there.

[tyho]

https://en.wikipedia.org/wiki/Diesel_engine_runaway

[i_am_proteus]

Discharging a CO2 bottle into the air intake is the usual ticket.