I would prefer this as MAS-LTT daily via KR
1. Chennai, Katpadi, Salem, Erode, CBE daily connection to Uduppi, Goa and Konkan coast.. Timing is perfect to extend all the way to LTT and start from MAS
2. Chennai-CBE/Salem train b/w Shatabdi and West Coast.
3. CBE/Salem train b/w West Coast and Allepey-Bokaro exp
4....
more... MAJN-MAO ONT
5. Salem/CBE/Palghat alternate or shorter route to Mumbai
Lot of advantages for below slot..
MAS 09:00 SA 13:30 CBE 16:15 MAJN 23:15 MAO 05:00 LTT 13:30
LTT 15:00 MAO 23:30 MAJN 04:00 CBE 10:45 SA 13:30 MAS 18:30