Cast_Iron writes
Is this some mechanism to allow "inter-city" trains to run
from the north, right through London and down to the
South-East. Or is it nowhere near that sensible?

When completed the current East London Line project will
allow that as

I don't consider Highbury to Croydon/Crystal Palace trains
as being 'InterCity' - they will be local trains.

will the existing line betrween Willesden Junction and
Clapham.

Watford to Brighton trains? They are regional trains
rather than 'InterCity'.

Who said anything about existing service, I was talking about what the
new and existing railway will allow to happen.

There will be no InterCity trains via the ELL, only local ones.

What plans are there for InterCity trains via the Willesden-Clapham
route? I'm certainly not aware of any.

So please do enlighten us 'about what the new and existing railway will
allow to happen'.

--
Dave