On 2012-08-23 13:30:07 +0000, Graham J said:


To run the whole service reliably (and it's designed for up to 18 or even 20
tph ultimately) with adequate turnround times and margins you'd need a
four platform station at Highbury, and there isn't room.

I was just wondering what the factors are that makes Highbury different
from other two platform terminals with higher service levels, e.g.
Brixton on the Victoria Line.

Surely it's that we're talking about a very different line that's not
provisioned to run at the same frequency owing to volumes. At present
trains run every 7-8 minutes from Highbury, and every five minutes from
Dalston Jnction (going south). This is very similar to a lot of metro
lines in other big cities on the continent. You can wait longer at
Whitechapel for an H&C train.

I'm sure there are technical reasons too - these are bigger, havier
trains that i expect do not work like tube trains.

E.