Following the successful introduction of bio-toilets in the Hazrat Nizamuddin-Indore Intercity Express, all trains maintained by Delhi Division of the Northern Railways are slated to have bio-toilets or, as they are termed, green toilets. The expansion of bio-toilets will protect tracks from damage due to open discharge and put an end to manual scavenging. Around 3000 toilets will be put up in 750 coaches in the first phase. In the second phase, other Divisions of the Railways will follow suit.