On 18 Jul 2005 20:17:11 -0700 someone who may be "Minna Daisuki
Katamari Damacy" wrote this:-

The effects of dangling tripcocks striking raised trainstops doesnt
seem to be a problem.

About 100 years ago the problem of striking raised trainstops at
speed led to the failure of a number of devices based on the method.
The NER persisted, but only by using a ramp a bit like the GWR ramp
to give some of the indications on their Fog Signalling Apparatus.
Since then metallurgy has progressed, but there is only so much that
can be done about fatigue.

Striking a trainstop occasionally at high speed is very different to
striking them regularly at high speed. One of the reasons there are
tripcock testers is to ensure that the arm has not broken off.


--
David Hansen, Edinburgh | PGP email preferred-key number F566DA0E
I will always explain revoked keys, unless the UK government
prevents me by using the RIP Act 2000.