Would love to see this engine produced in HO.
http://www.bcarchives.gov.bc.ca/cgi-bin/www2i/.visual/img_med/dir_117/c_09228.gif
saw one from the 50s in bad condition on ebay a couple of weeks ago and the price for it was $80ish and the bids were going up fast.
Looking at that, the engine probably would be a good seller.
What train. I don't see a train.
But you do still have another option: Scratch build one. Yes, it's time consuming and you may need to learn a few new skills but those are reasons to do a project, not reasons to avoid it. And I promise you'll be very proud when you look at a complicated project which you researched, designed and built yourself.
-- D