It is surprising that there are no dedicated trains between Mumbai and Delhi apart from Rajdhani, Duronto, Garib Rath and Sampark Kranti some of which dont even have daily run. I mean, only Sampark Kranti has SL class which sees huge demand and waiting list. Railways should make Sampark Kranti daily. I wonder why they have not increased the frequency of this train although it is been running since more than a decade!