How much is the toilet on the bullet train

I also fell in love with the stainless steel vacuum toilet on the high-speed rail, but unfortunately it was not sold, haha.

There are two principles of flushing of the toilet, one is the straight flush type, the other is the siphon type, the straight flush type of punch is all completed by the up and down difference of the water flow, that is to say, the more the punch, the greater the water is advocated, so such a toilet in the glaze and the smoothness of the pipe after improvement, the water can be a little less but the punch is still OK. Siphon type means that when the water rotates through the pipe and falls downward, it will produce a suction, and some pipes will add a nozzle to increase the strength of the flush, so as to achieve less water but no reduction in the impulse.