<P> Electronics manufacturing is a growing industry in Tamil Nadu, with many international companies like Nokia, Flextronics, Motorola, Sony - Ericsson, Foxconn, Samsung, Cisco, Moser Baer, Lenovo, Samsung, Dell, Sanmina - SCI, Texas Instruments having chosen Chennai as their south Asian manufacturing hub . Products manufactured include circuit boards and cellular phone handsets . </P> <P> Tamil Nadu is the second largest software exporter by value in India . Software exports from Tamil Nadu grew from ₹ 76 billion ($1.6 billion) in 2003--04 to ₹ 207 billion ($5 billion) by 2006--07 according to NASSCOM and to ₹ 366 billion in 2008--09 which shows 29 per cent growth in software exports according to STPI . Major national and global IT Companies such as Syntel, Infosys, Wipro, HCL, Tata Consultancy Services, Verizon, Hewlett - Packard, Bosch, Amazon.com, eBay, PayPal, IBM, Accenture, Ramco Systems, DXC Technology, Cognizant Technology solutions, Tech Mahindra, Polaris, Aricent, MphasiS, Mindtree, Hexaware Technologies and many others have offices in Tamil Nadu . The top engineering colleges in Tamil Nadu have been a major recruiting hub for the IT firms . According to estimates, about 50 per cent of the HR required for the IT and ITES industry was being sourced from the State . Coimbatore is the second largest software producer in the state, next to Chennai . </P> <P> Tamil Nadu has a transportation system that connects all parts of the state. TNSTC Online Booking Portal Tamil Nadu is served by an extensive road network, providing links between urban centres, agricultural market - places and rural areas . There are 29 national highways in the state, covering a total distance of 5,006.14 km (3,110.67 mi). The state is also a terminus for the Golden Quadrilateral project, that connects Indian metropolises like (New Delhi, Mumbai, Bengaluru, Chennai and Kolkata). The state has a total road length of 167,000 km (104,000 mi), of which 60,628 km (37,672 mi) are maintained by Highways Department . This is nearly 2.5 times higher than the density of all - India road network . The major road junctions are Chennai, Vellore, Madurai, Trichy, Coimbatore, Salem, Tirunelveli, Tuticorin, Karur, Krishnagiri, Dindigul, Kanniyakumari . Road transport is provided by state owned Tamil Nadu State Transport Corporation and State Express Transport Corporation . Almost every part of state is well connected by buses 24 hours a day . The State accounted for 13.6 per cent of all accidents in the country With 66,238 accidents in 2013, 11.3 per cent of all road accident deaths and 15 per cent of all road - related injuries, according to data provided by the Ministry of Road Transport and Highways . Although Tamil Nadu accounts for the highest number of road accidents in India, it also leads in having reduced the number of fatalities in accident - prone areas with deployment of personnel and a sustained awareness campaign . The number of deaths at areas decreased from 1,053 in 2011 to 881 in 2012 and 867 in 2013 . </P> <P> Tamil Nadu has a well - developed rail network as part of Southern Railway . Headquartered at Chennai, the Southern Railway network extends over a large area of India's southern peninsula, covering the states of Tamil Nadu, Kerala, Puducherry, a small portion of Karnataka and a small portion of Andhra Pradesh . Express trains connect the state capital Chennai with Mumbai, Delhi and Kolkata . Chennai Central is gateway for train towards north whereas Chennai Egmore serves as gateway for south . Tamil Nadu has a total railway track length of 5,952 km (3,698 mi) and there are 532 railway stations in the state . The network connects the state with most major cities in India . The Nilgiri Mountain Railway is one of the UNESCO World Heritage Site connecting Ooty on the hills and Mettupalayam in the foot hills which is in turn connected to Coimbatore city . The centenary old Pamban Bridge over sea connecting Rameswaram in Pamban island to mainland is an engineering marvel . It is one of the oldest cantilever bridges still in operation, the double - leaf bascule bridge section can be raised to let boats and small ships pass through Palk Strait in Indian Ocean . Chennai has a well - established suburban railway network and is constructing a Chennai Metro with phase1 operational since July 2015 . Major railway junctions (4 & above lines) in the state are Chennai, Coimbatore, Katpadi, Madurai, Salem, Erode, Dindigul, Karur, Nagercoil, Tiruchirapalli and Tirunelveli . Chennai Central, Madurai Junction, Katpadi Junction, Chennai Egmore, Salem Junction, Tiruchirappalli Junction, Coimbatore Junction are upgraded to A1 grade level . Loco sheds are located at Erode, Arakkonam, Royapuram in Chennai and Tondaiyarpet in Chennai, Ponmalai (GOC) in Tiruchirappalli as Diesel Loco Shed . The loco shed at Erode is a huge composite Electric and Diesel Loco shed . MRTS which covers from Chennai Beach to Velachery, and metro rail also running between Alandur and koyambedu station . </P>

Which state is big karnataka or tamil nadu