Sorry for the earlier answer-Either of the following will apply as TDR can be filed only after chart preparation and in case of online tickets
(b) If the ticket is presented for cancellation within 24 hours and up to four hours before the scheduled departure of the train, cancellation charges shall be 25% of the fare subject to the min. flat rate mentioned in clause (a).
(c)...
more... If the ticket is presented for cancellation within four hours before the scheduled departure of the train and up to :
Three hours, when the ticket is for a destination station up to 200 KM.,
Six hours, when the ticket is for a destination station of more than 200 KM but up to 500 KM., and
Twelve hours , when the ticket is for a destination station of more than 500 KM.,
after the actual departure of the train, cancellation charges shall be 50 % of the fare subject to the min. flat rate mentioned in clause (a).
Provided that for night train leaving between 21:00 hours and 06:00 hours (actual departures), refunds shall be admissible at the station within the time limit specified above or within four hours after the opening of reservation office, whichever is later.
By the way one query?? All started commenting my answer but no one gave the answer-any reason?