On Fri, 11 Nov 2011 15:24:07 -0800 (PST), Jamie Thompson
wrote:

On Nov 11, 10:34*pm, wrote:
On Fri, 11 Nov 2011 20:54:41 +0000, Charles Ellson

wrote:
On Fri, 11 Nov 2011 08:35:12 -0800 (PST), allantracy
wrote:

The main benefit of the Croxley Link is connectivity between South
Bucks (on the Met) and the WCML and vice-versa.

To that end, perhaps Overground services from Euston could reverse and
continue in an Amersham direction.

You can't run 3rd-rail stock on the Met.

Charles:

I defer to your knowledge of the infrastructure, but what would have
to be done, and how much would it cost to make this possible?

Educate me.

Regards
JonH

..indeed, as would I. I'd have though they would be compatible as I
thought all TfL's lines used the same 4 rail system of
electrification,

LO is a National Railway service run on behalf of TfL on mostly
Network Rail infrastructure. Class 378 stock is 750v 3-rail/25kV
equipped.

but even if they're not, I'd have thought they would
be compatible by historical virtue that the LO shares tracks with (and
is therefore compatible with) the Bakerloo,

It works the other way round (in both senses). The DC line has a 4th
rail bonded to the traction return running rail so that 4-rail stock
can run over it. It used to be wired LT-style as 4-rail but was
converted to conventional feed (with the "extra" 3th rail) in the
early 1970s.

which used to have the
branch to Stanmore, so effectively operated over the Met between
Finchley Road and Wembley, though in reality only in and out of
Neasden depot. I know a lot of time has passed, but I wouldn't have
thought things would have diverged too much.

They haven't. LU trains are still the "intruders" on the DC line.