Low TAT creates problems. If need be there, it should have a circular RSA like this: LTT-PUNE-GTL-SBC-CBE AND THEN CBE-CLT-MAJN-MAO-LTT. Via Konkan, CBE-LTT can be covered in 22-23 hours. After reaching CBE, can start after 2-3 hours in the opposite direction. This will give CBE a much awaited connectivity to Konkan also.
Full round trip in 60 hours: From Mumbai 29 hours to CBE via GTL, 3 hour TAT, 22-23 hours to LTT via Konkan and again after 5-6 hour cleanup/ maint, repeat the cycle. Another train in anti-clockwise direction.