There should really be a way of doing that in case, as is mostly the case for roughly 50% of the passengers, they have only urinated and not used any paper. The water is really wasted when about 50% of uses won't really require any.
I should probably know better than to ask this question, but how could you possibly know what % of toilet visitors only urinate?!
If you are sitting splashback is a risk....
Sometimes more than just splash back is on the cards, certainly based on my years on the Networker fleet, and seeing the results of their toilets “reversing” when flushed, on a couple of occasions .
Generally the person concerned would appear on the platform looking disoriented, covered in mostly brown liquid matter, stinking to high heaven, and would be recommended to make a precautionary visit to hospital. The key takeaway is, when visiting the loo on a train, *always* lower the seat before you flush…
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