What is TDR in IRCTC

TDR ( Ticket Deposit Receipt) – If the customer was not able to perform the journey due to any /or the following reason :
  • Train Cancelled By Railways and Passenger Not Travelled.
  • Train running Late by More than Three hours.
  • Difference of Fare in case proper coach not attached.
  • AC Failure
  • Travelled without proper ID proof
  • Wrongly charged by TTE
  • Party partially travelled
  • Passenger Not travelled
See IRCTC wesite for more information

But, as many people have experience filing TDR will be of no use,

Read some of them  Here