Comment 4 for bug 1252167

I believe the coal burner works as expected and needs no change. It consumes input wares until the economy target is met.

Set the coal burner trunk priority to low and trunks will go to other sites more often than the coal burner. You ought to check to see how much difference running a coal burner really makes - just because you have zero trunks in stock does not mean that your wood economy is broken. If you have plenty of trunks being generated then you may have zero spare, but still enjoy a healthy economy.