I guess it might take similar route as that of the Okha-RMM train which maybe RU-Katpadi-Salem-Karur-Dindigul-Madurai-RMM. The other option could be to come all the way till Coimbatore then go via Pollachi-Madurai-RMM. I am not aware if there are other routes. We will have to wait and see when it comes out