Talk to a RailFan - you will learn a LOT about Trains.

1. Food :- No Pantry!
Lunch most probably is picked at Dhanbad at 12 ' noon! Dinner at MGS-BSB. In a nutshell, better make your own arrangements!
2. Punctuality :- Only been upto BSB by this train, so here is my limited observation. Train gets a high priority run upto MGS-BSB! Expect a non stop DHN-GAYA and GAYA-MGS run. Priority goven by ECR (DHN-MGS) is higher than than priority given by homezone ER (HWH-ASN) as it trails the Poorva by 5-10 mins upto ASN. Expect good punctuality.
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Cleaniless :- Coach maintainence is superb by ER. Almost all coaches are 2010+ manufactured coaches. Cleaniless is fantastic upto MGS, can't comment after that. Cleaning staff is available.
4. Lhbfication :- No chance at present!
5. EMD Link :-Maybe a Lucknow EMD may spring a surprise as an offlink because a MGS ALCO is a normal link.
6. BSB halt of 25 mins :- Dinner is picked up at BSB. As per why the train halts 25 mins, I can't comment on it! :(
Hope it helped!!!