Yes dear..... this is the most required one.
I have mentioned it in my proposed budget for Goa that Both VLKN - VSG & MAS - VSG have to be made Triweekly.
As far as the timings of VLKN - VSG is concerned, VSG - VLKN can be made to depart at 02.30 pm from VSG so that it enters TN from dawn... For VLKN - VSG, the timings are perfect. only thing these trains require speeding up...