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Colin Rosenstiel · November 16th 06, 05:53 PM posted to uk.transport.london

In article ,
(Peter Corser) wrote:

"Colin Rosenstiel" wrote in message
...
In article . com,
(TheOneKEA) wrote:

While doing a bit of idle research into the upcoming Standard
Stock (aka 'S' Stock) being designed for the Underground's Sub
Surface Lines, I came across an interesting note which stated that
regenerative braking is to be provided and used by the S stock on
the SSL lines, and _only_ on the SSL lines - the S stock running
District Line services to Richmond and Wimbledon will not
regenerate when they are on NR metals.

I'm guessing that the trains will achieve this by using some
kind of mechanism which can detect the voltage level of the negative
pole of the traction circuit and subsequently cut in the regen
mechanism when the negative pole is within the appropriate voltage
range. Does anyone know how this could be accomplished?

How modern! The O Stock of 1937 was designed for regeneration!

There's no reason in principle why the trains shouldn't use
regeneration on NR too. It will just need modifications to the power
supply system. I hope they get on and make them so that the trains'
energy consumption is reduced.

Colin

The O stock used metadyne control with the regen being part of a
closed loop control system - IIRC (need to check "Steam to
Silver"!) there was no regen to the rails, as such.

The Metadyne system was capable of and intended to provide regenerative
braking. The problem was that the power supply was never modified to
take regeneration and the system wasn't reliable enough, being
electro-mechanical.

Please don't top-post here, BTW.

--
Colin Rosenstiel

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