On Thu, 15 Feb 2007 21:53:21 +0000 (UTC), "Nick Lawford"
wrote:

"Boltar" wrote in message

What for?

I'll throw that one back at you and ask ''why not''. The Bakerloo goes
to Harrow (and used to go to Watford), the ELLX is projecting LU service
over NR routes, Croxley link (if ever) are examples.

Its being designed for the tube system

Actually, no its not.

S-stock does NOT run in the tubes but on the sub-surface lines.

not national rail.
Different radio
systems, different ATP systems

So what ?

Stop looking at details and think about the bigger picture.

, possibly a slightly different loading
gauge,. not to mention
the 4th rail shoes dangling inbetween the rails that could foul some
mainline track systems.

So 4th rail surface trains are out of gauge at Wimbledon and Richmond
are they ?

They are out of gauge WRT to normal NR clearances. This does not
matter when they are running normally over lines where required
clearances are maintained.

Met A stock knocks NR infrasture to pieces every time one
goes to Amersham ?

It doesn't run over NR infrastructure; the line has always belonged
solely or jointly to LU and its predecessors.

S-stock is being built as common stock for all sub-surface lines. I'd be
pretty sure that spec would more or less put them within NR gauge.

It won't. The out-of-gauge-ness of LU surface stock is principally
around floor level and just below IIRC; this is mitigated to some
extent by the general shortness of the vehicles compared with main
line stock so that in general precautions are only necessary while
passing through platforms on curves or over crossovers within
platforms. AFAIAA it is standard practice to remove the shoegear when
LU trains are dragged over NR lines other than those over which they
are cleared to operate.

snip