This service connects the cities of Chennai to Karaikudi via Tiruchirappalli in the Indian state of Tamil Nadu.

Vaigai and Pallavan are the only MG trains on the SR to be fitted with specially enhanced buffers and certified to run at 110 km/h.

For the first time on the MG, the ICF manufactured two 40-seat AC chair car coaches exclusively for the Vaigai and Pallavan express and used in those trains.

Then from 1986, Pallavan SuperFast Express was made to run till Tiruchchirappalli Junction where it faced a slot change.

This express runs along with Vaigai Superfast serves as fastest public commutation mode between Chennai and Tiruchchirappalli/Karaikkudi apart from air.

[4] On 25 April 2018, Front wheels of WDP4D numbered 40405 which hauled 12606 UP Karaikkudi - Chennai Pallavan Superfast Express derailed while entering Tiruchchirappalli Junction railway station at 6:27 am.