Bhopal Shatabdi: chalti hai ek dum hawa ke mafik, speed aisi ke ruka de traffic - Varun

Reservation against cancellation. ticket gets confirmed when cnf/rac passengers before us cancels their ticket.
Here's what railways describes:
The passengers whose names figure under R.A.C., are provided reserved sitting accommodation initially and are likely to get berths becoming vacant due to last minutes cancellation of reservation of passengers not turning up in time before the departure of the train,.

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Please see this: /faq/post/110

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good one :)

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