Though H-LHB rakes can do 130 km/hr, but they are certified to do max 120 km/hr.. But from experience of travelling on the train, I can say that the train have a tendency to do 124-126 km/hr at patches... Again HWH Raj has halts at Kanpur, Allahabad, Mughal Sarai, Gaya, Parasnath, and Dhanbad. Whereas Duronto has halts at Kanpur, Mughal Sarai and Dhanbad (though the Up Duronto has an additional halt at Gaya)..