On Fri, Jan 08, 2016 at 09:39:14PM +0000, Basil Jet wrote:

However, I'm interested in the Streatham Common Hub. It seems to be
suggesting that new platforms would be built on the Thameslink tracks
(Streatham to Tooting / Eastfields) but not on the South Central tracks
(Balham to Eastfields). But the new Thameslink platforms would be a long
distance from the current station, so I'm wondering if the existing
station would be moved northward past the junction

Unlikely, given that they've only just finished extending it southwards.

I expect that there would either be a footpath from Streatham Common
Low Level to SC High Level, or it would be an OSI with passengers
walking along Eardley Road.

I have to say, looking at a map I struggle to find many journeys which
the new interchange would allow that you can't do now by changing at
Streatham.

It won't allow any new journeys but it will make some quicker or more
frequent because you won't have to wait for the right train to take you
from Down South to Streatham to change, you'll be able to just get the
first train that comes along and change at Streatham Common.

--
David Cantrell | http://www.cantrell.org.uk/david

Irregular English:
ladies glow; gentlemen perspire; brutes, oafs and athletes sweat