On Sun, 17 Jul 2005 20:44:02 +0100, David Hansen wrote:

That probably/possibly involves the tripcock arms on the rear units
regularly striking a trackside trainstop arm at considerable speed,
once on each trip. This will be where the train enters the area
fitted with LT signalling. That can't be good for the life of the
arms and they are likely to break off

Why should the speed ("considerable" or otherwise) be a matter of
concern for these arms, but not for the leading one? Unless there is
significant acceleration or deceleration, won't it be more or less the
same speed for all of them?

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