On Aug 12, 11:55 pm, somersetchris somersetchris.
wrote:

But they are going to build a junction there anyway when the ELL comes
through!

Yes, but it's all about conflicts. The ELL service to Highbury won't
conflict with trains on the northern pair at all, and only in one
direction with the southern pair. For a service to Finsbury Park,
trains in both directions would have to cross or run on all four
tracks somewhere.

The only bottle neck will be Canonbury tunnel.

I meant the ECML diveunder south of Finsbury Park station, which I
don't think could be fixed to be double track very easily (I realise
there is a second track already, but it's pretty heavily used by
trains from Moorgate)

U

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