For Train No 22447/48,Most of passengers travelled on weekend between delhi and Chandi garh and Ambala and vice-versa. On weekdays,rush is less.
So in order to provide service on Friday,schedule has been changed.
For 22439/40,reason may be that people travel to Mata Vaishno devi on Tuesday(totally a guess).
please wait...Translate to EnglishYo, for Train No 22447/48, most of the peeps travel on the weekends between Delhi and Chandigarh and Ambala and vice versa. But on weekdays, it's not as crowded, you feel me? So, to keep things running smooth on Fridays, they switched up the schedule. Now for 22439/40, there might be a reason why folks be making moves to Mata Vaishno Devi on Tuesdays (just takin' a wild guess here).