FireBox
Out of all the engines on the iron road, BigBoy had the largest
FireBox of all. It was 22 feet long! Temperatures inside the FireBox
got as hot as 1500°F! The top part of the FireBox was called
the Crown Sheet. It was the hottest part of the FireBox, most
steam was produced there. It had to continuously be surrounded
by water, otherwise, it would get so hot that the entire structure
would melt, causing catastrophic boiler failure resulting in a
boiler explosion.
Grate Area: 150.3 sq. ft.
The outside of BigBoy 4017's FireBox
The Inside of BigBoy 4017's FireBox
those odd upside-down T shaped structures are
for added water circulation, increasing the efficiency of the
firebox
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