I was in a train going North-East from Beijing (can't remember where we were going, or more to the point, whether it was a 'rural' train or not) as little as 5 years ago, and the grandmother in the section opposite the corridor from us made here grandson go nr 2 right there in the middle of the train. Every time the train would swerve, the turds would roll from left to right and back :O| Cultural differences be damned, who in their right mind would accept this as a common practice...