Instead to Garhwa road make halt at Garhwa. At Garhwa road junction it will require reversal, if via garhwa then there is by-pass to avoid it. Also chopan can be by passed with halt at Obra dam and Crew change will happen at SGRL. NKJ doesn't have facilities and it is just yard and a loco shed and hence not consider it as point for reversal . You can choose Katni main , or Katni murwara for reversal, Katni murwara will be preferred by me