Firebox (steam engine)

Steam engine firebox

The firedoor into the firebox of a steam locomotive. The firebox peak temperature is approximately 2,500 °F (1,370 °C)

In a steam engine, the firebox is the area where the fuel is burned, producing heat to boil the water in the boiler. Most are somewhat box-shaped, hence the name. The hot gases generated in the firebox are pulled through a rack of tubes running through the boiler.^[1][2]