On Mon, 30 Mar 2009 01:43:00 +0100, Tom Anderson wrote:

I've just realised that was a north to east curve off the Lea Valley line
to the Chingford Line

Yup, this was called the Coppermill Curve.

Sorry, complete reading failure there. That's the exact opposite of the
Coppermill Curve!

It was the Hall Farm Curve, if you want to look it up (there was a
campaign a year or two back to reopen it in time for the Olympics -
one proposal was for all Chingford trains to (permanently) run via
Stratford, freeing capacity on the main West Anglia line).