When you book your Indian Railways tickets then sometimes your ticket is on RAC List. Reservation Against Cancellation or RAC tickets means that when you will get a berth on the train then it will not be assigned to you only, but it will be shared by a co-passenger.
Most the side lower seats are to be shared with a co-passengers, but if there are some free seats available in the train then the TTE of the train may allot you a complete seat, but if there is no free seat available, you will have to share your berth with a co-passenger.
If you want a full berth for your journey, you can cancel RAC tickets with minimal cancellation charges. Any RAC ticket can be canceled up to 30 minutes before the departure of the train from the original station.
No refund will be given if RAC tickets are canceled post minutes before the departure of the train from the original station.
If the ticket is an e-ticket i.e booked online, then it should be canceled over the internet and the refund will be credited to the user’s account.
If the train is late more than 3 hours of the scheduled departure time, then full fare will be refunded to the passenger on the condition that the ticket was canceled before the departure of the train.
If the train is canceled then the whole fare amount will be refunded to the passenger without any cancellation charges.