Boat Mail Express
The Rameswaram (Boat Mail) Express, formerly known as the Boat Mail or Indo-Ceylon Express, is an express train connecting Rameswaram with the Tamil Nadu state capital Chennai via Tambaram, Chengalpattu, Melmaruvathur, Viluppuram, Cuddalore Port, Chidambaram, Sirkazhi, Mayiladuthurai, Thanjavur, Tiruchchirappalli, Pudukkottai, Karaikudi, Sivagangai, Manamadurai, Paramakkudi, and Ramanathapuram. In the 20th century, it operated as a combined train-steamer ferry-train service between India and Sri Lanka, linking Chennai and Colombo, the capital of modern-day Sri Lanka (then Ceylon).