I've had to get multiple long distance trains this last week and on several journeys have had to stand in corridors near the toilets as it's been so busy. For various reasons I've not really used trains in about 20 years!
I honestly thought it was common knowledge that you don't flush train toilets whilst at a station? Or has that changed in the last 20 years?
It's like people are actually waiting for the train to stop moving to get out of their seats and head for the loo - over and over at station after station 