yes actually there is no spare rake for North East...there is 3 weekly rakes available of TVC GHY,ERS GHY,MS GHY which spends good amt of time in GHY & sometimes sent as North East...thats why sometimes extra rakes are pressed into service which was noted yesterday,but no such spare rake was available today so train is indefinitely re-scheduled.
PS:Min TAT required for a rake after primary maintenance in any NFR depot is 9 hrs.