Other day I saw some good feature in Toilets of Jaipur Indore train's AB1 boggy. It was half 3AC and half 2AC. but in toilet there was a exhaust fan which I have never seen before even in rajdhani coached so I guess it was new design but very effective because even if you dont have a fan inside the toilet but exhaust fan could solve the problem of Stinking of toilets. and it should implement in sleeper and general coaches also