With Chalukya and Sharavati starting, we have few peculiar situations:
1. Two daily trains between Mumbai and Hubli within one hour gap and second train overtakes the first.
2. Two daily trains between Mumbai and Bangalore within one hour gap and second train is faster by 2 hours.
3. Two trains between Mumbai and Thirunelveli within one hour gap on 4 days...
more... a week.
4. Two trains between Mumbai and Villupuram within one hour gap on 2 days a week.
5. Two trains between Mumbai and Katpadi within one hour gap on 4 days a week and no trains on other 3 days.
6. Hubli to Bangalore takes 10 hours, 3 hours more than normal.