Train Running More Than Three Hours Late and Passenger Not Travelled
No cancellation charge or clerkage shall be levied and full fare shall be refunded to all passengers holding reserved, RAC and wait-listed tickets, if the journey is not undertaken due to late running of the train by more than three hours of the scheduled departure of the train from the station commencing journey subject to the condition that
(a) In case of e-ticket, the TDR is filed online before the actual departure of the train for availing full refund.
(b) In case of i-ticket, the ticket surrendered upto the actual departure of the train.
(c) In case the ticket is cancelled or surrendered or if the request for refund of fare is filed online after the actual departure of train. No refund of fare shall be admissible.
Source: http://contents.irctc.co.in