"D1053" wrote in message
...

snip
And some trains turn round in the platform. While people
generally leave the train at the terminus, there will be a
new batch waiting to get on. As the driver walks back, how
can they tell if a person sitting in a carriage should have got
off or has just got on?

LOL, in the context of the OP, would it matter?! Also if someone
has only just got on and is already 'asleep in their seat' isn't
that a cause for concern anyway...
--
BBC = Biased Broadcasting Corporation...
Time for the BBC tax to be repealed.
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