On Sun, 23 May 2010 12:13:10 -0700 (PDT), Stephen Furley
wrote:

Looking North at Dalston,
the line seems to curve to the West; Is there any provision to be
able to re-build the East curve if needed in the future? It doesn't
look like it.

I'm pretty sure it's protected. The car park and access road to the
Kingsland Shopping Centre are on the route of the curve.

Hackney council a couple of years back published (ambitious) plans to
create a park above the eastern curve and also allow development above
the western curve.