Re: Locks fitted on NSW country trains

["Barry Campbell" <campblbm@ozemail.com.au>]

David Johnson wrote in message <3A16ACDD.722F2EA7@ozemail.com.au>...
>Eben Levy wrote:
>
>> Locking equipment was started to be installed from a couple of years ago,
it
>> all started when a young boy apperently "FELL" out of a syd-mlb XPT,
there
>> aqre thories he was pushed and all.... I know DJ did testing on the doors
to
>> see how much force you needed to open whilst in motion and it was
apperantly
>> to much for a kid of his age..... Dave? any more info you can provide?
>
>Turning the handle wasn't a problem, the air pressure difference would be
the
>deciding factor, which increases with train speed.
>
I assume this means that the air pressure outside is less (Bernoulli
effect?) so that the door tends to be kept closed by pressure of the air
conditioning.


Barry Campbell