On Tue, 15 Apr 2008, Clive D. W. Feather wrote:

In article 8cSdnZ5L0Zmsq2LanZ2dnUVZ8uidnZ2d@plusnet, Colin McKenzie
writes

Hmm. From a state of ignorance:
- how hard would it be to quadruple to Neasden?

Very. For example, it would be useful to have platforms on either the
Met. or the Chiltern lines at West Hampstead to allow a connection to
Thameslink and the NLL, but there isn't even the room to do that.

There may not be space to add bank platforms [1] outside the Met tracks,
but isn't there space to rebuild the station as a pair of islands between
the Met and Jubilee pairs? Doing this would of course be hopelessly
expensive and inconvenient.

You are of course right that there isn't room for platforms on the
Chiltern tracks, at least not without demolishing the houses on the north
side of Broadhurst Gardens or doing something equally ludicrous like
rerouting the line through tubes under the station.

tom

[1] Not sure what the proper name for these is - platforms outside the
tracks, as opposed to island platforms which are between them.

--
Tubes are the foul subterranean entrails of the London beast, stuffed
with the day's foetid offerings. -- Tokugawa