In 2021, Indian Railways completed the phaseout of drop chute toilets, replacing them with indigenously developed bio-toilets. Apart from improving hygiene, the phaseout will save Indian Railways 4 billion rupees annually, due to the elimination of corrosion on the rails caused by human waste. They were replaced with bio-vacuum toilets, which use bacteria to decompose human waste, fulfilling a phaseout pledge made in 2010.
