only for the trains that originate that Nagpur it will show current aval status Bhai... Suppose if there is no trains that originate at Nagpur then the above msg is shown..
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In this case you have to check the aval at the originating station and get a ticket at Nagpur, if it has current reservation Counter.
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If...
more... Nagpur doesnt have current reservation counter, then it is better to get a general ticket and pay the ETF TO TTE...
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This Current reservation Aval is still a Vague one.. IR needs to refine it..