When on a train, especially inter-city, dont fall into the trap of feeling you have to use the nearest toilet. People walk up and down the train for various reasons: going to the buffet car, stretching legs, getting some cooler air in the lobbies, going for a chat with a friend further down the train, and even looking for a free toilet etc etc. What I would like you to pick up is that if the toilet in your carriage is busy, go for a walk and use a different one. First class toilets are usually quieter cos there are fewer passengers in them.
As for being heard: I once had a major vomiting and diarrhieoa session on a busy commuter train in a small sliding door toilet. Loud retching and explosive evacuation (sorry but I want to make the point), and multiple flushings of the toilet, lasting what seemed about ten minutes. On exit, no-one looked up. So your normal use of a toilet will pass unnoticed.
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