Both have diffrent day run & schedule, while partial slot sharing @ intermediate station happens!!
Even with 2hrs 10 mins difference (not 2.5 hrs), train's arrival @ ERN is hardly 10 minutes behind....
Both get OT by: Matsyagandha, KCVL GR/Exp.....While Tiruveneli Exp dont OT 01067, but Duronto OT 01065, which keeps the impact of late ARR @ MAO but incidentally, it covers the same till ERN & is hardly 10 mins behind 01067!!!
Thats not ridiculous, if u simply check reason behind slack & if it gets covered later or not!!!