nice ideas......
but... the TL 377/2 are needed at southern for Milton Keynes strengthening for a start
New layout for the suburban 377s has been mentioned in Dft and Network Rail documents, but no more than a mention i believe. This shouldve been done when the 377s got refreshed.... but currently 377s are used so expansively youll find a unit on an Ore to Victoria being used on a Victora to Sutton via Crystal Palace just hours later for example.
and the 313s are definately at southern until at least the end of the franchise.
But the 377/5s will be on Southern... And more of them!
313s should be gone - the point is that we should devise a fleet strategy now that fits the future.