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[email protected] · February 18th 11, 09:48 AM posted to uk.transport.london

On Wed, 16 Feb 2011 19:16:24 +0000
"Clive D. W. Feather" wrote:
In message , d
wrote:
Given all the harmonics produced by modern electronic power systems on trains
surely most track circuits would be pretty well filtered anyway?

It's the other way round: electronic power systems are required to
filter their output so that they don't generate frequencies likely to
interfere with track circuits.

I'm sure I remember something being mentioned about the northern line signalling
having to be immunised when the 95 stock was introduced. *shrug*

B2003