"Peter Masson" wrote in message
...

"Mizter T" wrote

OK, excuse me for being a bit dense, I haven't entirely got my head
around these new post-ELLX arrangements on the NLL yet. Peter has
previously explained that there will be two pairs of tracks from the
junction just west of Dalston[*] to Camden Rd, and ELLX will have
exclusive use as far as H&I.

So Canonbury station will have four platform faces, one for each track
- and there will be separate platforms there for NLL and ELLX trains.
What is to happen at H&I - are there to be separate platforms as well
- and also what happens at Caledonian Road & Barnsbury, are the ELLX
trains not actually going to terminate there - or are they going to
turf everyone out at H&I and then reverse somewhere between H&I and
Caledonian Rd & Barnsbury?

Is there going to be any same platform interchange between NLL and
ELLX at either H&I or Caledonian Rd & Barnsbury? This would have
obvious benefits for the passenger, but I guess it would also have the
consequence of meaning extended dwell times at whichever station the
ELLX trains turf everyone out at - thus clogging the whole line up.
AIUI lifts are in the pipeline at H&I - for the existing platforms at
least - and one presumes that lifts would be provided for any new
platforms, so the station would at least offer accessible level
interchange for passengers to change platforms between ELLX and NLL.

December Modern Railways suggests:
Dalston to Highbury & Islington ELLX will have the southern pair and NLL
the
northern pair (doubled from Canonbury) with 4 platforms at each of
Canonbury
and H&I. ELLX will terminate in the platforms at H&I, though Dalston
Junction will have 4 platforms, with the outer tracks for through trains
to/from H&I and the inner pair for trains that terminate at Dalston
Junction.

Having 4 platform faces at Dalston Junction seems a bit of an extravagance
now that there will be dedicated tracks for the ELLX as far as H&I. How
about a single centre turnback platform, save a bit on the station costs,
and run more of the trains to H&I?

I'm assuming here that the published proportion terminating at DJ possibly
pre-dates the recent decision to four track to H&I allowing pairing by
use...

Paul S