Railways have installed 11,777 bio-toilets in 4,356 passenger coaches till June this year, Lok Sabha was informed today.
It is planned to fit bio-toilets in the entire fleet of coaches by 2021-22, Railway Minister Sadananda Gowda said in a written reply.
There are many trains including Mahanagri Express, Konark Express, Janmabhumi Express, Jodhpur Express, Bundelkhand Express, Mussoorie Express, Aravali Express which have been partially equipped with bio toilets.
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Introduction of bio-toilets in coaches will mitigate the problem of direct discharge of human waste on the tracks.
In a bio-toilet, the human waste is treated by bacteria which converts it into water, and that is why the system is environment-friendly and improves overall hygiene.