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.
Architecture of Tamil Nadu Architecture of Tamil Nadu Tamil Nadu architecture that emerged thousands of years ago. The Pallavas ruled from AD (600–900) and their greatest constructed accomplishments are the single rock temples in Mahabalipuram and their capital Kanchipuram, now located in Tamil Nadu. Pallavas were pioneers of south Indian architecture. The greatest accomplishments of the Pallava architecture are the rock-cut temples at Mahabalipuram. There are excavated pillared halls and monolithic shrines known as rathas in Mahabalipuram. Mention must be made here of the Shore Temple constructed by Narasimhavarman II near Mahabalipuram which is a UNESCO World Heritage Site. The Chola kings ruled from