Me too expecting DEMU to run till GR, not expecting SBC-NED exp diversion as it has been running on that route since decades but would be good if at all it runs via Wadi, GR, Bidar saving time.
Good chances to divert GR-SC exp via Bidar, as it has low patronage. GR-SC via Wadi is 221Kms while GR-Bidar-SC is 280Kms, so journey time will increase by 1hr-1hr15mins but gives a morning connection from GR to Bidar and evening connection from Bidar to GR.