On Sat, 02 Sep 2006 10:21:43 +0100, Ian Rivett wrote:


The black and yellow plate is called a "Weak Field Switch". It allows
more current to the motors to allow them to go faster. It used to be
fitted to all trains like 38 stock, R stock, Q stock etc as well as the
A stock and was a method of going faster when needed. The idea of it
being visible is that it can be seen by the train controllers and
drivers can get into trouble for using it when not authorised. On the
Met line it is used all the time.

More modern stock since the 60's I don't think have this arrangement.
I've never seen one on a 67 or 72 stock or anything newer.

Ian

Thanks Ian, all that District line stuff threw me. Will make sure I only
board a train showing a weak field switch in future ;-)

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