Hi Larry thanks for the videos.  I'll be working on that e-unit soon. 
Meantime I'm wondering if you'd know what kind of smoke unit is in the 1988 8601 Great Northern that I had initially posted?  I've thrown in a few drops of smoke fluid and I see a few wisps but nothing if you are not really looking for it. But you can smell it. I'm just wondering if the models from the late 80s were fan driven?  I'm wondering if old fluid has crystallized in the chamber.
Thanks