When it was 110 mps LHB , it was not properly maintained and due to which only this train was the Last to get 130 mps after ECoR upgraded the maintenance standard and coaches condition.
As 130 mps train coaches needs higher safety standards and maintenance.
But biggest question is how come GZB WAP 7 was not given at KGP ? it got Offlink GZB Wap 4.