On Sun, 5 Nov 2006 18:37:45 -0000, "Tim Roll-Pickering"
wrote:

David of Broadway wrote:

How wide are the islands though? Leaving aside the shops on those
platforms, the available space for moving down them is so narrow that
most of the time passengers need both sides to move down, especially if
you're trying to get round a buggy. And how exactly would you construct a
TfL users only sealed route from the eastbound Central Line to the DLR
platform?

Fairly wide. These should give you a rough idea:

http://www.flickr.com/photos/triborough/92363857/

These look as if they are made by Cubic as they resemble LU second
generation gates very closely.

http://www.nycsubway.org/perl/show?22191

If I read those images correctly, that's much wider than the Stratford
platforms. No way could a barrier setup like that work there.

What is not visible (and I don't know the NYC location) is how long the
platform is and how many gate arrays there are. The other factor is
train frequency and the volume of people transferring. Some London
locations can get between 8 and 12 car trains at 1-2 headways which
would require very high numbers of gates to clear those alighting before
the next train arrives - that is before you get people transferring in
the opposite direction and any accumulated crowds who have been unable
to get on their connecting train. If we take Stratford as an example it
is not unusual for people to be unable to board the first Central Line
train at the height of the peak and thus you need standing room.

Nonetheless I still think it is rather academic as you simply could not
create such installations at almost all LU to NR "within one station"
interchanges as things stand today.

Years and years ago I dragged round a set of consultants from KPMG to
explain how the fare validities work and what that means for ticket
validation requirements at the most complex interchanges. Now, if
anything, it has become much more complicated with TOC specific
validities as well as what has happened with TfL fares. While I can see
other cities can obviously spend the money and have the space to install
inter-system checks it won't work in London unless someone chucks
several hundreds of millions of pounds at reconstruction of key
stations.

--
Paul C


Admits to working for London Underground!