The Cementipede.
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I LIKE it ! It would look good on my RR 
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For a while the local (Roanoke, VA) Blue Cross/Blue Shield took to calling themselves Trigon. Somehow that name drew up an articulated three-piece gondola car in my mind. (I guess that would only happen to a train enthusiast!)
Regards, David Meashey
Is that a real car? Asking for a friend 
Yes. Dubious functionality, But then again; there’s a prototype for everything.
That’s a 3d printed O scale kit based on the model built by the famous John Armstrong.
Here is the original
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When you building one, Dan?
I guess if you want a real prototype, you can build the Super Hopper.