Mizter T wrote:

Re your comments about the need to continue to Finsbury Park - as I
said earlier some of the ELLX services will continue to Highbury &
Islington which will provide a interchange with both the Victoria Line
and FCC's Great Northern line. The North London line around Canonbury
is either three or four track, and trains continuing up to Finsbury
Park via the Canonbury Curve would mean they'd have to cross all the
tracks on the level, blocking them all up - operationally going to
High & I and reversing somewhere beyond there appears to be
preferable. Plus there is the possibility that such trains will go
beyond High & I in the future - perhaps up to Willesden Junction via
Primrose Hill.

As ever, more info is on alwaystouchout:
http://www.alwaystouchout.com/project/3

Seems that one (albeit costly) way to improve the NLL capacity and
congestion issue would be to build a dive-under to swap the NLL/ELL
passenger service and freight trains somewhere between Dalston and the
Canonbury curve. This would allow ELL trains from the south to access the
Canonbury curve and the NLL diverging later at Camden without crossing the
frieght lines. So the ELL/NLL passenger services pair of tracks would be
north of the freight pair between Camden and Canonbury, and south between
Canonbury and Dalston. Between Primrose Hill and Camden, and Dalston and
Hackney, the one pair would have to accommodate both passenger and freight
services.

Angus