Thank you for taking the trouble to make those suggestions. The Terrier might end up working a light railway terminus or through station but it is as likely (shock horror) to end up pulling wagons round a Christmas tree, although not this Christmas. Either idea is likely to vanish if someone announces the three gas turbines in 00 or any number of other things.
Incidentally, if I were Dave, I would avoid producing anything already produced but in need of improvement, the King is a good example of how that can come unstuck. I'd also avoid anything at the top of wish lists. The risk of duplication is too high. What he needs to do is look for something relatively obscure - the sort of thing we didn't know we wanted until it appears.
I had a long and interesting chat to a member of the Bachmann staff before the London Transport Museum special trip and he said that Bachmann's response to the C class's rapid disappearance off the shelves was, "Hello! :-)" He was quite right. Although I have a C class built from a kit, Bachmann has succeeded in generating an appetite for pre-nationalisation Cs that I never knew I had. Over to you Dave!