Q: Was coal from mine to offsite washing/crushing plant to end customer in any way similar to grain storage to flour mill to end customer? IIRC there were either special tariffs or waybills for the later.
It would fit the definition of an in-transit processing, but unless the tariffs for coal before and after washing are significantly different, there would be no advantage. But I don't know for sure.
Tony Thompson Editor, Signature Press, Berkeley, CA