This is the train station you need if you want to leave Karaikal by train. You can book a ticket either here or in the booking office on the Bharathiyar Road in Karaikal.
The station is located in Nagore — a pleasant little town close to Karaikal. There are buses from Karaikal bus stand to Nagore every few minutes.
When the bus arrives, make sure you jump into it as fast as you can, so you’ll be able to travel to Nagore inside the bus. If you delay for a second, you might get an authentic Indian experience of traveling in a bus full to bursting, literally hanging out of the door.