Waiting room (mostly at platform no. 1) is one of the finest facility provided by Indian Railways at most of the railway stations in India. I many times try to avail this wonderful facility. All one has to do is to share details (from which train one is coming and by which train leaving in next few hours) with the person at the entrance of upper class waiting room at New Delhi Railway Station to register without paying any amount. It is a good facility to fresh oneself. Upper Class Waiting Room at New Delhi Railway Station is having toilet as well as bath facility. Yes, few times cleanliness is an issue at few waiting rooms.
Waiting rooms are classified as per train tickets such as Upper Class, Sleeper Class etc. Check your train ticket to avail facility.
A dream: To have a bathroom inside train specially if the journey is more than 24/48 hours.