Mahdeiya is the entry point of ECR near Singrauli, where the control is handed over by JBP division of WCR to DHN division of ECR....
Similarly Pradhankanta is the exit point of ECR post Dhanbad, where the control is handed over by DHN division of ECR to ASN division of ER!
It is unlikely that the train will go from Singrauli to Dhanbad via CAR (LR)-DDU-GAYA or GHD(LR)-DOS(LR)-GAYA. Plus looking at the TT it seems obvious that this train would go through the Coal India Corridor.....