Economy of Tamil Nadu projects under operation in the public-private partnership (PPP) model. It is currently working on upgrading its road network, though the pace of work is considered slow. Tamil Nadu has a well-developed rail network as part of Southern Railway. Headquartered at Chennai, the present Southern Railway network extends over a large area of India's Southern Peninsula, covering the states of Tamil Nadu, Kerala, Puducherry, minor portions of Karnataka and Andhra Pradesh. Tamil Nadu has a total railway track length of 6,693 km and there are 690 railway stations in the state. The system connects it with most major cities in India.
Geography of Tamil Nadu Geography of Tamil Nadu Tamil Nadu is the eleventh largest state in India and covers an area of . It is bordered by Kerala to the west, Karnataka to the northwest, Andhra Pradesh to the north, the Bay of Bengal to the east and the Indian Ocean to the south. Cape Comorin (Kanyakumari), the southernmost tip of the Indian Peninsula which is the meeting point of the Arabian Sea, the Bay of Bengal, and the Indian Ocean. The western, southern and the north-western parts are hilly and rich in vegetation. Tamil Nadu is the only state in India which has