To check the PNR status for Indian Railways, enter the PNR online at IndianRail.gov, or use SMS to send "PNR" followed by the 10-digit number to 139. Apps such as GetJar's Rail Yatra app for Android devices or Karan Checker's PNR Status Info for iPhone also offer PNR status-checking tools.
The PNR, or passenger name record, is a 10-digit sequence of numbers located on the top-left corner of an Indian Railways ticket. A number of different codes indicate the ticket's status, including WL, which means you are on a waiting list, and RAC, which means you have a reservation against a cancellation. You need to continue checking your PNR status until you see the code CNF/Confirmed. The status REGRET/WL means no more booking is allowed.