Section 7(4) in The Railway Passengers (Cancellation of Ticket and Refund of Fare) Rules, 2015
(4)In case no facility of cancellation of RAC ticket or wait-listed ticket issued through PRS is available at the station originating the journey for night trains leaving between 2100 hours and 0600 hours (actual departure), the refund of fare shall be admissible at the station within first two hours after the opening of reservation office.
