** ACDD operation at 180kmph is a Great news!
** ACDD chaircar is a sort of high capacity ACC Economy class.
** Capacity of ACDD coach is 120 against just 78 of ACC, i.e. about 50% higher. Hence the costing of ACDD is much lower than the ACC class, a part of the benefit should also be passed on to the travellers.
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more... Since capacity of ACDD coach is 120 against just 78 of ACC, i.e. about 50% higher. To popularize ACDD class, IR should keep its prices lesser than normal AC Chairclass by 15-30%