In article .com,
TheOneKEA writes
I'm making a general inquiry. Most of the stuff I've read from District
Line drivers states that the slightest wet down there causes massive
problems with the signalling.

This doesn't surprise me.

There's always a certain amount of current leaking between the rails
through the ballast; in effect you have to treat the circuit as having a
resistor there rather than a gap. The resistance varies *a lot* between
wet and dry conditions, and tuning the parameters of the circuit so that
this leakage doesn't look like a train is a bit of a fine art. If it's
got slightly wrong, the TC will drop out, looking to the rest of the
system like a train where no train should be. Hence problems.

The different electrical arrangements south of Putney, and the need to
interface with NR signalling, doesn't help either.

I was just curious as to whether or not
those problems could cause a wrong-side failure.

This would surprise me.

--
Clive D.W. Feather | Home:
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