Charlie,
Sometimes it is easy to mix up these Pennsy steamers,at least for me. I thought that the N1 was made by 3rd Rail. I'll have to check it out when I return home tonight. I'd go for which ever one that was not produced,N1 or N2.
I ordered the K5 also--what are the chances that Lionel would do one?
Slim to none probably.
Keeping my fingers crosssed,
Norm