Take this for what it’s worth, but I’ve read that the “bugs” in N&W’s “Jawn Henry” could probably have been worked out if the experiment continued. As it was, “Jawn Henry” really didn’t do the job any better than a Y6b did, and at more than the cost of a Y6b. If other 'roads showed any interest in a steam turbo-electric N&W might have continued the developmental work with the eye on sales to other 'roads, thus lowering the production costs, but none did, so the project died. “Sic transit gloria mundi…”