On Wed, 3 Jan 2007 18:17:23 +0000, Tom Anderson wrote:

Having said that, I'd hazard a guess that the Hammersmith-Aldgate
service won't run off-peak (otherwise why send the Met to Barking?),

Hang on, what? What do you mean by the 'Hammersmith-Aldgate service'?

I refer you to your previous post:

"Metropolitan trains would run through from Liverpool Street to
Barking, and the Hammersmith & City service would run partially to
Aldgate..."

Why won't it run off-peak? How is this related to the Met?

Perhaps it was a bit of a leap, but I was thinking that if the Teacup
service is 6tph off-peak, there might not be a need for additional
trains from Hammersmith as the frequency on that branch would be high
enough anyway. If the trains from Hammersmith to Barking don't run
off-peak, there would be no through service between the East End and
the northern Circle at those times - hence the Met/H&C Aldgate/Barking
swap.


Thinking about it a bit more, unless I'm missing something, the
suggested service pattern seems to be hopelessly inefficient in terms
of movements across Praed Street Junction.

Let's assume the Wimbleware frequency is 6tph (as at present), the
Teacup runs at 7tph peak / 6tph off-peak (same as the current
Circle/H&C frequency), and suppose for now the Hammersmith-Aldgate
frequency is 0tph. This results in exactly the same number of
movements across Praed St Jn as at present. The frequency of trains
from Edgware Road to each of Hammersmith, Wimbledon, and Gloucester
Road (and beyond) stays the same, but the frequency of trains through
to Baker Street and King's Cross is halved. That would, however, allow
more trains to run through from the Met to the City (perhaps that's
the whole idea?).

Now add in say 6tph Hammersmith-Aldgate. This restores the frequency
on all routes to present levels, except it doubles the frequency on
the Hammersmith branch. This is, of course, good. However, Praed St Jn
is now hopelessly congested.

What am I missing here?