The entrance of the toilet on the train is so small, how can the poop rush down

In the train toilet, you can see a button or a handle or something like a knob when you squat down and look up, and you can hear the rumbling sound when you press the button or break the handle, and the excrement can be washed down and discharged along the track with the force of the train, which is naturally purified.

Friends who often take trains may know that the hole on the squatting toilet in many train toilets is very small, only the thickness of a thumb, so how are large pieces of feces washed down? This brings us to the history of the reform of train toilets.

That's a vacuum toilet with negative pressure underneath, sucking it in! Don't throw toilet paper, sanitary napkins and other things inside, it will be clogged and affect the use of others.