The answer to that is so obvious that the question doesn't need to be asked. But then the obvious is not always obvious until it is stated. I see there is the Isle of Wight route being released on TSW2 and isn't there the West Somerset in both TS and TSW? Also, AFAIK a lot of the UK rolling stock in TSW already exists in TS.
No don't delete it, it is valid, one I've thought myself. I would like see the EastCoastway and the Trans Pennine in TS. The route research is there, Why not make them?