Adrian Auer-Hudson wrote:
GreatWesternSean wrote:

"I can think of many:


1) Central Line & Metropolitan line at Ruislip. Both cross each other
yet no interchange. However a track does connect both lines. VERY long
walk at any nearest station to get from one line to the other.

Unfortunately I think the passenger usage here would be far too low to
be worthwhile. However, the interchange at Park Royal will help many of
the Met/Picc passengers wanting Central line destinations.

2) Central Line & Piccadilly line at Park Royal. There is no station on
the central line at Park Royal despite it running under the piccadilly
line next to Park Royal station. There is now a new business park next
to the central line tracks in this area so a station wouldn't be
lightly used!

This has been planned in detail in connection with a further phase of
construction at the business park, and should be open at some point in
the next few years (although it's entirely dependent on the business
park). I believe it is being secured through a Section 106 agreement, so
the developers will have to build it in order to build the next phase of
the park - although I'm not totally certain on that.

http://www.alwaystouchout.com/project/33

3) Central Line & Silverlink Metro at North Acton. There are no
silverlink platforms at North Acton despite it crossing the central
line here. One has to walk for 20 minutes to get to Willesden Junction
to board a silverlink train.

Somewhat frustrating but there are no plans for such an interchange yet.
It gets talked about every so often, but I imagine the business case is
problematic as Silverlink platforms might interfere with freight
operations between the Great Western and NLL/WCML/MML etc.

The Central/WLL interchange at Shepherd's Bush (which is currently
scheduled to open in Autumn 2006) could go some of the way to aiding
with this, if TfL ask Silverlink to put on Stratford-Clapham Junction
trains. It wouldn't help people heading in the other direction on the
NLL, however.

4) Central Line & Hammersmith + City line at Shepherds Bush. Although
White City is served by the Central line, it is not served by H&C
despite the tracks running right over the station!
Again, one must walk quite a long way for a train.

Approved and will soon be under construction in connection with the
shopping centre. The Central line platforms are currently staying where
they are, so interchange will be a couple of hundred metres on-street,
but further development to the north of the shopping centre may
precipitate a new entrance to the Central line station to bring it
closer to the new (well, revived) H&C station.

http://www.alwaystouchout.com/project/24

I can't think of any others yet. But have there been or are there any
plans for any of the above to be rectified?

There are plenty of others, very few of which are actually in any state
of progress. For the others, someone will float the idea, but it's
usually difficult to get a decent business case for it.

Examples of (sort of) progressing ones: West Hampstead (a proper
interchange including the Met line as opposed to an on-street pain in
the proverbial), Watford Junction Met line, Brixton (ELL/SLL with other
lines, although the costs aren't stacking up very favourably at the moment).

Examples of ones where the idea is around: Brockley, Camden Road/Camden
Town.

I do wonder whether the business cases for some of these interchanges -
particularly those on the NLL - would be strengthened if they were
considered as a package rather than in isolation.

--
Dave Arquati
Imperial College, SW7
www.alwaystouchout.com - Transport projects in London