In message , Mrs Redboots
writes

I don't know about Mait001, but I was assuming these trains would not
stop everywhere, just at major stations - Richmond perhaps, but not
Barnes! And maybe not even Richmond.... first stop Feltham, perhaps,
and make the most of the link to Heathrow?

If they didn't stop at Putney, Richmond and Twickenham they wouldn't
replace the existing service, they would have to be additional - and
there is absolutely no way that line can take a more intense service
west of Barnes.
--
Paul Terry