In article , Leo
Lichtman says...

I watched a video about steam locomotives the other day. The top of the
firebox is normally below the water level, but if the water got low, this
steel plate got uncovered. This would cause it to get red hot, and a boiler
explosion would result. This would not be prevented by a relief valve or a
pressure gauge. The sight glasses were the only protection.

This is a crown sheet explosion. The top of the firebox is called
the crown sheet and if this becomes uncovered, or if the crownsheet
stay bolts erode away, bad things happened.

Recently several people were killed at a fair in Ohio because
a poorly maintained steam tractor blew up that way.

Jim


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