Thread: The Bletchley Fly-over
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Old April 18th 16, 09:35 PM posted to uk.transport.london
[email protected] rosenstiel@cix.compulink.co.uk is offline
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Default The Bletchley Fly-over and Verney Junction
In article , (bob) wrote:

Recliner wrote:
Charles Ellson wrote:
On Sun, 17 Apr 2016 18:29:31 -0500, Christopher A. Lee
wrote:

On Sun, 17 Apr 2016 20:56:35 -0000 (UTC), Recliner
wrote:

What's wrong with just using 3rd rail beyond Amersham,

More expensive, obsolete, less efficient and it's heading toward 25kV
territory.

Much *cheaper*, surely? Less efficient, yes, but why should it matter
that it's headed towards 25kV territory?

The high cost of DC 3rd rail comes from the need for more complex and far
more frequent substations. You can get a lot of 25 kV line covered from a
single feed.

Like Milton (north of Cambridge) to King's Lynn. Having single feed sections
quite that long has consequences, though.

--
Colin Rosenstiel
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