Good creativity. Already Chendur is pretty much covering everything.
Chennai(Tirutani)
Kumbakonam (Swamimalai)
Dindigul(Palani)
Madurai(Palamudir cholai & Tiruparangundram)
Tiruchendur....
more...
Since you named this train as Arupadai exp, add Swami malai and Tiruparangundram as a commercial halt.
Swamimali railway station has been updated with high level platforms. And can hold 10-12 coaches in it.