One min., if the train runs via GTL, the territory of SCR ends at GTL, then it travel on SWR route till Londa or Belgaum or Miraj (Not sure), and then enter CR. This doesn't benefit any of the CR territories except for KOP and neither SCR territories except SC. In this case, the train belongs to SCR and benefits SWR. And the train travels through three railway zones, so there should be consensus of all three. Instead if it goes via Kurduvadi, it benefits many of these CR territories and also increases a train from SUR-KOP and SUR-HYB.