From past few months the sdah dur is going horribly late!! Which was making it to step downwards in terms of RESPECT and PUNCTUALITY. Many railfans suggested that "agar wap7 hota to kuch had tak late make up ho jata"(because of it's higher pulling strenght) (it is mainly depended on the route and weather but pulling/speed strenght of loco is also taken in consideration when we talk about making up the late) so, i asked DRM Sdah about that and see what she said that it will get WAP7 as it is available!