As a suggestion I would prefer if this train runs from Vasco to mangalore and then travel via Bantwal, subramanya, sakleshpur , hassan, yesvantpur , salem, erode, trichy and then Velankanni .
In this way it will add one more train to Mangalore and coastal Karnataka. and this train should pass on the bangalore- mangalore route on Sundays as there is no day train on Sunday.
There are so many trains between Mangalore to Shorannur already.