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For more on marking an answer as the "Best Answer", please visit our FAQ.I can confirm that, in france in 1998, the train toilet emptied directly onto the tracks, i could see them and the ground below going past. Unfortunately, i couldn`t read the french sign that said `Dont use if the train is in a station`. Maybe if all trains did this nowadays, then there would be no need to tell children not to play on the tracks!
Trains built before the 1980s dumped straight onto the track. Now you might even be washing your hands in recycled water. Have a look at http://www.nature.com/nsu/021202/021202-1.html