For other AC and special coaches, the Controlled Discharge Toilet Systems (CDTS) had been installed by railways which were designed to ensure that waste from the toilets is retained in tanks while the train is waiting at a station or it is passing through city limits. When the train picks up certain speed (say 30kmph) the waste gets discharged on to the tracks. “This system had helped to keep the stations and tracks within the city limits clean but at outskirts and at certain points the situation deteriorated. So green toilets using bio-digesters is a better solution.
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