Reservation against Cancellation

A Reservation Against Cancellation (RAC) is a type of ticket that can be purchased for travel on the Indian Railways. Although it ensures certainty of travel, it does not guarantee a berth. A berth will be allocated to the person who reserves an RAC ticket if passengers already have confirmed ticket do not turn up before the train departure or get
Found on http://en.wikipedia.org/wiki/Reservation_against_Cancellation
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