India's First Green Corridor Train Opens in Tamil Nadu: Indian Rail equpped with bio toilet.

Green Corridor image
A step Towards Swatch Bharat.

India's first Green Train Corridor, the 114 km long Rameswaram-Manamadurai track in Tamil Nadu was inaugurated on 24th July,2016. A Green Train Corridor Project means that the trains travelling in that path should be equipped with Bio-Toilets.

What is Bio-Toilet?

Bio Toilet Image

A bio toilet is a type of dry toilet that uses a predominantly aerobic processing system to treat human excreta, by composting or managed aerobic decomposition.

These toilets generally use little to no water and may be used as an alternative to flush toilets. They have found use in situations where no suitable water supply or sewer system and sewage treatment plant is available to capture the nutrients in human excreta. They are in use in many roadside facilities and national parks in Sweden, Canada, US, UK and Australia. They are used in rural holiday homes in Sweden and Finland.

The human excreta is usually mixed with sawdust, coconutcoir or peat moss to facilitate aerobic processing, liquid absorption, and odor mitigation. Most composting toilets use slow, cold composting conditions, sometimes connected to a secondary external composting step.Composting toilets produce a compost that may be used for horticultural or agricultural soil enrichment if the local regulations allow this.

Bio-Toilets discharge zero waste on to the tracks thus making the process of cleaning the tracks very easier. These special toilets developed by the Indian Railways and the Defence Research And Development Organisation(DRDO) collect human waste in tanks and decomposes the waste using bacteria, thus ensuring zero discharge on tracks.


  • Zero toilet discharge.
  • Hybrid Vacuum Toilets having biodigester tank beneath railway coaches containing Anaerobic Bacteria that converts human faecal into water and gas by hydrolysis, acetogenesis, acidogenesis and methanogenesis.
  • Vacuum toilets take 500 Millilitres of water to flush while a typical toilet takes 10-15litres per flush.

About India's Green Corridor Railway, Tamil Nadu. Why Tamil Nadu?

Green Corridor Railway image

Green Corridor Railway Tamil Nadu image

The first train to be fitted with these bio-toilets was the short distance train between Rameshwaram - Manamadurai, not whole of Tamil Nadu as your question would make it sound.

These sections and stations were chosen, because the number of trains originating and terminating at these stations and sections are few, thus making it operationally easier and faster to make them human discharge free.

What Next?

In the second phase, Kanalus-Dwarka-Okha and Porbunder-Wansjalya section in Gujarat have been identified to be made zero toilet discharge sections.

How does bio-toilet work?

The Flow chart Image below explains the working of bio toilet.

Bio toilet flowchart image

Comaprison to Conventional Waste Management.

Bio toilet comparison image
It costs about Rs 3.5 lakh to install four Zero Discharge Toilet Systems in a coach.

What can hamper its success?

The Green Corridor Project, is commendable step by government and a step towards clean and green environment.

But Sadly we Indian sledom use public property properly :(...

  • People tend to flush wastage like plastic wrappers, bottles in railway toilets. These are non-degradable products that can affect decomposition process.
As a responsible citizens lets take an oath to use the system properly and make this Green Corrider project success; leading to maximum adoption.

Go Green!

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