I boarded in DD train Dhanbad-Howrah 5 times. Speed of the train was not good. At the turning place where track bends DD train runs very slowly. A caution of 30 Kmph only for DD is observed at the starting of Bally Chord Platform. But other train runs 90 kmph at the same turning point. DD train was very comfortable, maximum Seat was vacant. Little passengers use this train. I think IR can hardly manage revenue from this train