You are right, for a Shatabdi it is horrible. But considering that near Dehradun faster speeds are not suported, tracks are non-electric and out of 300 odd kms around 120-140 kms is a single track. There is little IR can do to increase speeds right now. They will have to either upgrade tracks which does not making business sense. If there are politicians or even Baba Ramdev putting pressure on politicians this route might see upgradation and then you can really see nice speeds on this route. As far as Brand Shatabdi is concerned, they can actually put new and clean coaches for the time being as nothing can be done w.r.t speed.