Yes, tip was asked. Many of the passengers paid. I also paid Rs 30, in spite of HORRIBLE service. :-( The train was always on time or way before time (upto 30 minutes early) at all stations, but still this train absolutely does not deserve to be called "Rajdhani" going by the in-coach service.
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Food was horrible. Tea was bad. Only one bottle of water provided for a 34 hour journey. Ice-cream was conveniently "forgotten" - maybe the surplus ice-cream will be used for "personal gain/profits" of staff. The coach attendant and...
more... food attendant were totally incompetent. AC was out of control. My fellow passenger said, "gareeb insaan ko tip de dena chahiye". I don't know how garib/amir he was, but I am not of the type who takes a stand on such issues. :-( I generally do as others do. :-) So I paid tip.
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Sorry to let everyone down.