Vishakhapatnam & Secunderabad are both top-class cities of A.P. Moreover temperature in this belt is more than 40 degrees C any time of the year..So AC Duronto is a sure shot success without any validation.
I'm surprised some people are questioning the success of KOAA-GHY Garib Rath Exp in this July...Temp of North East is b/w 17-25 Degrees C this time of the year..So a AC train may or may not be succesfull.