"Arthur Figgis" wrote

It still seems a bit vague as to what the future services will be, no-one
seems to know what to do with the Sutton/Wimbledon loop, there are/were
the technical doubts about the rolling stock and automation needed to get
a zillion trains an hour through Farringdon, there seems to be a
possibility for something breaking at King's Lynn and wrecking all the
services at Eastbourne, and a while ago there was even speculation that
TfL or someone really wanted to have a North London Line-esque Croydon to
Somewhere in North London inner-suburban service, with everyone who wants
to pass through London having to change onto then off it (at bit like on
if a future High Speed N turfs everyone onto Crossrail at some kind of
West London Parkway to avoid needing to rebuild Euston).

Things are becoming a lot clearer as the relevant Route Utilisation
Strategies are developed. In particular, the Thameslink trains which don't
go via London Bridge will head down the Catford Loop. The rebuilding of
Blackfriars will provide two bay platforms on the west side, which will be
used for trains via Herne Hill, including the Wimbledon/Sutton loop.

Peter