Martin asked, "Still have no answers to: just how many P48 engines has Sunset brought in in the last decade? How about the other importers for that matter?"
I'm not sure I understand what difference it would make to the conversation. Having said that, the short answer would be, none. So what? Sunset did produce replacement drivers, in P:48, for some of their steam engines. If memory serves, they were for the SP/UP mikes and, later, the SP 2-10-2. Glacier Park produced conversion kits for their models and so did Overland. Were there other? I don't know, didn't keep track. Conversion sets are available for Sunset diesels.
Jay