the 8pm to 10 pm is highly crowded slot at NDLS and GZB.
Plus this train was conceived to take the rush off from from USK and Pooja Exp.
So there is no chance in change in its current schedule.
Extension till Katra will be an issue since RMJK-UHP-KATRA stretch cannot handle lot of trains due to obvious infrastructure deficiencies.
And,...
more... Railway board will be hard pressed to accommodate request for Katra trains from various zones.
This will put this on last ladder of the priority list.