It's no longer a collection of trains. There's a brand new wing (we attended on opening day) with simulators for learning to pilot a train (is that the right word?). And of course the model train layout, which seems to have expanded over the ~8 years since our last visit. Even The Girl got into it, and she's developed a habit of telling everyone loudly that certain things had no value at all. Such as the short animated movie we were lucky enough to preview at the Ghibli museum.
It's like someone at the model train store told us when we were buying The Boy's kit: no one looks at a model train layout and says, "Well that's crap."