Are you not willing to travel on your RAC (Reservation Against Cancellation) tickets? IRCTC (Indian Railway Catering and Tourism Corporation) allows the facility of ticket cancellation through online TDR (Ticket Deposit Receipt) filing 30 minutes before the departure time, said IRCTC in a tweet posted on its official handle- @IRCTCofficial. TDR filing can also be done online in special cases when the chart is prepared but the passenger could not travel by the train he/she booked the ticket. Users can file the TDR and also track status of the refund case through tracking service provided by IRCTC, according to the official website of IRCTC- irctc.co.in. An RAC ticket is an Indian Railways ticket that ensures certainty of travel but does not guarantee a berth.