evidence: Download Solution PDFWith reference to bio-toilets used by the Indian Railways, consider the following statements: [...] - The bio-toilets, which have been developed by the railways and the Defence Research & Development Organisation (DRDO), have a colony of anaerobic bacteria, kept in a container under the lavatories that convert human waste into water and small amounts of gases. Hence statement 1 is incorrect. [...] Additional Information - Gwalior-Varanasi Bundelkhand Express was the first bio-toilet-fitted train that has been running since January 2011.