I have doubt regarding this. I don't know about other industries. But JSW steel plant has it's own loco shed and locos of this shed will be used only inside plant. "JSW" will be written on these locos not "Indian Railways". Whereas IR locos will continue to haul freight trains with iron ore, other raw materials and finish products as they come out of the JSW steel plant. I am not sure whether loco transfer is possible from IR to private industry, loco purchase might be possible. As far as I saw JSW locos will be smaller in size compared to regular IR locos