Metzger28, the double-decker wagon has mesh errors, so you cannot convert. the rest works.
Glad to know the double-decker model was the issue. That was primarily the one I was working for, but at the end of the day, not a huge deal.
I had a few others here and there that I had used in TPF1 that also give me grief. There's a Metra Highliner for TPF1 that converts successfully, but used the wheel/bogey setup from the default TPF1 Metroliner, so it crashes (points specifically to this model) when running a map with it. I found the mesh/model files for this missing piece - I'm assuming it's a bit more involved to fix something like that?
Thanks again!