When I responded earlier I was critisised for being blunt. I really wanted to inject a touch of reality. If a coach kit is £50.00, people are not going to learn to built one if they won't risk their money b*lloxing it up. But expecting manufacturers/societies/shops to risk their money on a RTR loco is alright?
The perception in the trade is the plastic RTR guys want everything on a plate, and this would almost certainly manifest itself if ever a RTR J36 or whatever were produced. First the armchair rivet-counters would weight in, then the people who consider RTR locos should be priced to suit them.
It goes without saying Hornby and Bachmann will consider every aspect of a loco before commiting it to the short-list. Realisticallly, a NBR 0-6-0 is no good to someone wanting a Caley 0-6-0 and the market is halved already! A more realistic proposition, maybe, is something that has the wow-factor of the S&DJR 2-8-0....... The Dunalastair V Pickersgill 4-4-0 built between 1916 and 1922 and lasted till 1962. Many people may have seen them in operation on railway videos.
I could at least pretent one was working on my layout in Yorkshire heading a railtour (which I would not do with an 0-6-0). For RTR manufacturers it offers Caley blue, LMS red, LMS lined black, BR early and late totems.
If it sells well, then the manufacturer will be encouraged to follow it with a Caley tank or good engine. It's a start.
I'm not trying to sway things one way or the other. I'm simply looking at it from a risk point of view.
Larry