The main argument is that the A1 Trust have shown how to do it, twice so far with the A1 and now the P2. If you want to build a new locomotive you.......build a new locomotive. They haven't sacrificed any loco to create these so, why do others? It isn't just a Castle, an 8F, a Hall or 2, 28XX, 42XX, 41XX, maybe a Pannier scrapped for spares. The 'there are already others' claim doesn't work because only 1 example is needed to represent any class so logically, scrap all the rest. Of course without Barry many lines could not operate so, having multiple Bulleids, Black 5's, Halls, 45XX is a blessing, not an irrelevance at all. Even more duplication with multiple diesel class survivors. Loads of 47's, 50's, 25's, 31's, the same number of Deltics as Castles ( I think ). Scrap most of them then.