This extension won't make much of a difference to the Mumbai-bound traffic.
Rather would benefit domestic travelers within Tamil Nadu to get to Tiruchendur during the day (you need to take one of the passenger/slow express trains and have to transit at Tirunelveli).
please wait...Translate to HindiYeh extension Mumbai-bound traffic mein zyada farak nahi layega.
Balki yeh Tamil Nadu ke domestic travelers ka fayda hoga, din mein Tiruchendur jaane ke liye (aapko passenger/slow express train mein safar karna hoga aur fir Tirunelveli mein transfer karna padega).