12305/12306 should run all days of the week in order to retain fastest and best connectivity between New Delhi and Kolkata and vice versa all days a week without skipping a day of week.It will help also people to reach Delhi at early convenient time with timely punctuality.Also slot is also convenient: Departure @16:40 from NDLS and Arrival at 12:05 at HWH next day.Kindly Flag and rate this train.Also suggest speedups of this train wherever it has to.