This is nothing, during the Sirathu derailment PR > AD > PNBE Raj were running neck to neck with a gap of ~ 30 kms b/w PR and Raj and in the middle was AD which proved to be a boon for Prayagraj Express. In the morning time AD reached NDLS first, Prayagraj Express was at SBB and Patna Rajdhani 180 kms behind :p