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In Germany, we replaced that system several decades ago, because at 160km/h+ that can become pretty risky to do.

Yep. Thats why there are signs telling you not to use the toilet at stations.

On the other hand the streets in the Netherlands are littered with dog poo..

Same in India, there are signs and rules against such usage.

But like many such things in India, very few actually care: http://www.thehindu.com/news/national/karnataka/you-may-be-f....

Honestly it seems like a reasonable system. That kind of waste will decompose extremely quickly.

That's true, but it's also a matter of volume. Flushing a toilet every 10 miles of track sounds fine, but with enough passangers it becomes pretty gross.

Huh. Do they have the pretense of a commode, or is it a hole sawn into the floor?