Something extremely funky going on with the whole thing. And I think it might be time to give up.

bagginsbill..  The objects aren't in a runtime folder, just the one I exported them to. I did have duplicates in another folder so deleted them & tried again but no luck. The caboose imported into Poser with no roof or wheels..

I spent this afternoon remapping some of the meshes & remodeled a couple to see if it that would help.  Also changed the way the texture is applied to the wheels. None of that helped either.

I'm sorry I don't have enough Poser experience to do the python script. Pretty much all I know are the basics & that's why I get so frustrated when something doesn't work. 

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Life may not be the party we hoped for but while we're here we should dance.