Bob, I figured you are right from Alpha's inspection. But the thought had occurred to me, and right off Alpha strikes me as observant and interested, not to be scared off if the foam got thick 
("foamer" is slang for someone "overenthusiastic" about trains, usually real ones..... sometimes seen as derogatory by certain railfans; others revel in it. I mostly think it's funny )
There is 117+ years of model train experience that forms a puzzle and we each hold some pieces. No advice here was some kind of huge mistake, it depends on the personal perspective.
