Hey guys,
Sorry that I didn't include pictures in my last post. I'll fix that now. I don't think that I can post pictures because of copyright so I will link them.
Side View. Marty Bernard from U.S.A., Public domain, via Wikimedia Commons
And here is a video of someone walking around an engine in the museum. Video
Here is the K-Line K 3238. The resemblance is pretty good in my view. K-Line Lackawanna 4-6-4
And just some information about the real locomotives. They were the only steam locomotives that NdeM bought new. Their name is spelled Niagra to reflect the Spanish pronunciation. They were small for 4-8-4s in order to handle lighter built track on parts of the NdeM system.