LESSON 2 - FUNDAMENTALS OF FOREST FIRE CONTROL
2.5 Source of Heat
Common sources of heat that cause fires include:
Flames applied directly to fuels.
Embers from a large heat source (spotting), engine exhaust, campfires.
Electrical arcing form sources such as broken power lines, trees lying across power lines and lightning.
Friction (when the brakes on a train are applied to slow down or stop, hot pieces of brake shoe are discharged).