In message , d
wrote:
Some years ago there was a very good post on uk.railway explaining some
of this. For example, third rail running rails need to be isolated from
earth to keep stray voltages away from underground pipes, but 25kV AC

I didn't know that about 3rd rail, I assumed the rails were grounded. Doesn't
that mean that theres a potential risk of electrocution just from the running
rails?

Yes, if they're not correctly controlled by the distribution system.

I used to commute on the same train as an electrification safety expert.
He once explained to me that, with the original wiring plans for HS1, a
broken cable on the Northern Line could resulting in someone standing on
the platforms at Ashford International getting electrocuted.

http://groups.google.com/group/uk.ra...05866eb1d7b1b0
http://groups.google.com/group/uk.ra...53349c291a59a1

are good postings on the topic, but I can't find the one I was thinking
of originally.

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Clive D.W. Feather | Home:
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