after Koraput u cant reach Araku with out stops It is impossible, and Araku don't have a maintenance facility not even to clean the train. check it beacuse Araku is having only 1 Platform if your train halts there what about other trains Especially Goods which are crossing Araku?
you have to extend it up to VSKP other wise it is very difficult. Extend it up to VSKP with stops in BGHU,SLPM,KTV,VZM. so u r train will be maintained there. one more option is u have to take a route of KGP-CTC-KUR,VZM- KTV-SLPM-BGHU-ARK-KRPU Which is good route than this route with 169 km less.