Delhi To Nagapattinam Rail Route Please Tell Me The Rail Route To Velankanni Church At Nagapattinam From Trichur (Kerala)?

Please tell me the Rail Route to Velankanni Church at Nagapattinam from Trichur (Kerala)? - delhi to nagapattinam rail route

I am a resident of New Delhi. During the summer vacation, I want to visit Velankanni Church in Nagapattinam. Please tell me the path of the train to the existence of Trichur. Trichur is my people, and I'll be there for the holidays.