in NJP HWH Shatabdi route(564 km)....around 107 km route b/w Khana-HWH has speed restriction of 130 kmph...If WDP-4 is capable then its surely does 130 in that section...remaining 457 km(Khana-New Jalpaiguri) speed restriction varies from 50-110 kmph as per tracks condition...
Another thing which needs to be considered is that this is only the 2nd Shatabdi in the country(after LKO Swarn Shatabdi) which crosses a Major river bridge of around 4km length with PSR of 40 kmph...you can see that LKO Swarn Shatabdi is also quite slow(PSR=110 kmph) b/w LKO-CNB(where it crosses Ganga River)...whereas 130 kmph zone starts only after CNB.