u n d e r a c h i e v e r
writes
My impression is that the NLL services proceed to the Lea Valley
platforms and continue up the Lea Valley line to Tottenham Hale etc.
Look at the blue lines on the maps in options 1,2,3 on the route
appraisal page:

http://www.tfl.gov.uk/dlr/developmen..._appraisal.htm

is the service likely to be reduced when they bring the ELL into
operation?

The current service is every 15 mins Richmond-Stratford isn't it? With
trains alternate trains continuing to North Woolwich? It already seems
pretty busy me on the few occasions I have used the service recently.
So I don't see how they could justify reducing the NLL service -
especially as the only section that both lines will serve is between
Canonbury and Highbury & Islington.

When the ELL is extended to H&I [1], 8 trains per hour are proposed -
with the existing 4 trains per hour, that means 12 trains per hour (or
one every 3 mins). I should hope that the infrastructure should be able
to cope with that.

[1] Trains will run almost as far as Caledonian Road & Barnsbury station
in order to reverse.
--
Dave