This is a good question and not one that can quickly be answered.Idris wrote:
Are there many examples of SF baseplate colours which cannot be linked to an RW model?
However, an interesting ongoing thread would be to have all SF baseplate colours pictured, in chronological order so we did not miss any, and then get the answer as to whether each one can be matched to a Reg wheel model or not. At the end of the exercise we would have our answers.