On Thu, 3 Mar 2016 14:12:55 +0000, Roland Perry
wrote:

In message , at 12:37:56 on
Thu, 3 Mar 2016, Recliner remarked:
People also complain about the earlier Victoria-Picc connection. There
must be something in the way to stop it dropping down halfway along.

http://husk.org/www.geocities.com/at.../ltgreenpk.gif

I think the 'thing' is the expensive buildings north of Piccadilly.
It's much easier, cheaper and safer to build station tunnels under a
(literally) green park than large buildings.

The Piccadilly Line platforms will be under the road, so the "thing" is
also under the road, towards the western end of the platforms.

No, the issue is that the current station building is linked by single
long escalators to Piccadilly line platforms that used to be under a
different surface building directly above the line, linked by lifts.
So the Picc platforms are under the road, but well to the east of the
current station building.

The Victoria line came next, at approximately right angles to the
east-west Piccadilly line, and the platforms were placed just south of
the road, for ease of construction. The escalators link to the
platforms about a third of the way along (which is better than
connecting to the extreme ends of the platforms, which is what happens
with the Piccadilly line).

The subsequent Jubilee line platforms are below and just to the east
of the Victoria platforms. Of course, if they'd known then about the
later change of route, with the new line not needing to swing so far
east, the Jubilee line might have had a very different configuration
at Green Park, with the platforms parallel to the Victoria line. They
might even have delivered cross-platform interchange with the Victoria
line, as at, say Baker Street.

But the Picc platforms are so far to the east of the station, that
there's no good way of connecting new north-south platforms to both
the station building and the Piccadilly platforms to the east. But
they could nevertheless have started the passage between them further
to the western end of the Piccadilly line platforms.