Satish sir and nadeem sir... Please Allow me to disagree here... Once we have a confirmation officially from pgpoartal that tatkal is not defined in tatkal we are not getting right reason for confirmation
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Now since this has confirmed there are only 2 things which comes to my mind 1) there is a extra coach and the passenger is accommodated in a different coach 2) lower berth quota under general booking has no takers the same is being diverter to eligible passengers under tatkal quota
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Other thing we could do is invite experts and find how this happened :)