Down 12802 Purushottam has charting stations :-
- NDLS,
- ALD at previous night 8 pm,
- DDU at previous night after 8 pm.
- Gaya at 9:15 am (4 hours before departure)...
more...
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In order to get confirm berth under GNWL, book from FTP and change Boarding point to Gaya. Even WL 500-700 gets confirm sureshot.
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Or at least book from AUBR, charting done along with DDU at previous night.