With the SMVB diversion, would be a good idea to get this extended to Tiruchendur and also do away with the Maniyachi Tiruchendur passenger (a curtailed version of the former Tuticorin-Tirunelveli-Tiruchendur passenger).
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).
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