"Nigel " wrote in message
...

There are regional variations in the UK albeit by only a tiny margin.

The Liverpool & Manchester 4' 8"
The London Tube 4' 8 3/8"
Uk Standard Guage 4' 8 1/2" (4' 8 " on tight curves)

and (I think) the Glasgopw Underground was 4' 7"


The Glasgow subway was 4ft, until modernisation when it was widened.

By 1mm. :-)

Official track gauge is normally specified in mm. As I recall, the BR
track gauge was actually changed a few years ago by a few mm.

Do you actually know when or where I could find out?

Burkey

In article , Bob Adams wrote:
In message , Nick Leverton
writes

The issue I read of, I don't know how far true though, was that the
Standard stock's hardened steel tyres wore the rails down excessivly
fast when they first went to the IoW.

I believe the wear increased exponentially at over 70 mph.
;-)

That's fast ;-)

Nick
--
"And we will be restoring neurotypicality just as soon as we are sure
what is normal anyway. Thank you". -- not quite DNA

In article , James
writes
If stock
which has wheels ¼" further apart tries to run on such rails, there
are likely to be no problems, although they may end up riding on the
wheel-flanges.

Riding on the flanges would not be a good thing. They aren't coned, so
the self-steering property of a wheelset wouldn't be there. And since
the flanges aren't in the right place to act as a last resort, you'd
derail within a few metres.

--
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