[eartick]

The materials engineers need to find an economic use for the coal firebox ash.

We (they) have. We use the different sizes on our private roads in the country. Cost is half of gravel and it does not get sticky when wet. It is dusty when it gets dry though

[ryderann]

“We use the different sizes on our private roads in the country.”

I can remember putting our clinkers on the driveway.