Never heard of the thing, had to look it up. Unless they were the most avid UP fan, I can't fathom why anyone would have interest in this engine. They/it were/was unsuccessful commercially and are about a minus 3 on the 1-10 styling scale (my opinion), and that was their good points.
Simon
The reference I saw said there was only one in a caption for an image and in text said 3 units were scrapped (thus my bold text).......make up your mind!