DKAE-GZB 130 kph fit but in phases. Underground fire in Barakar Coal Region & in Dhanbad area hampers 130 kph run of Howrah Rajdhani. Traffic density also matters. Howrah-Delhi line is vastly different from Delhi-Mumbai line. Controlling also matter. Mumbai-Delhi Western Line has just 4 Rajdhani trains. Howrah-Delhi Line has 10+ Rajdhani Express trains.