Guest post from Sanjay Banka of Banka BioLoo. Over 600 million Indians do not have access to toilets and are forced to defecate in the open, posing health hazards, raising environmental concerns and leading to water contamination. With an average 18 million people travelling by train every day, Indian Railways is ‘our lifeline’, says Namita Banka, founder and CEO of Banka BioLoo, but its toilets were ‘in a pitiful state’.