I saw it and was going to bid on it - I may have - but when I saw what was happening to the price I quickly walked away. It is a very appealing piece, in its way. I suspect that the superstructure was a Lionel 0-4-0 (that locomotive - a version of it - is still in production, and, indeed, a version of it appears in the latest Lionel catalogue) rather than an 0-6-0, but that's nit-picking, as it was certainly one or the other.
The price baffles me; the piece can't possibly appeal to the "purist" collectors out there - it's 2 PW pieces sliced, diced and joined. As for us scratch-bashers, we like this sort of thing, but, to me, it's $50 curiosity.