Economy of Tamil Nadu Main rail junctions in the state include Chennai, Coimbatore, Erode, Madurai, Salem, Tiruchirapalli and Tirunelveli . Chennai has a well-established Suburban Railway network, a Mass Rapid Transport System and is currently developing a Metro system, with its first underground stretch operational since May 2017. Tamil Nadu has a major international airport, Chennai International Airport, that is connected with 19 countries with more than 400 direct flights every day. Other international airports in Tamil Nadu include Coimbatore International Airport, Madurai International Airport and Tiruchirapalli International Airport. Chennai International Airport is currently the third largest airport in India after Mumbai and Delhi
State Industries Promotion Corporation of Tamil Nadu and Manapparai soon. SIPCOT IT Park is the largest Information Technology Park in Asia, located in Padur, Siruseri, along the IT Corridor, Chengalpattu taluk, Kancheepuram District. State Industries Promotion Corporation of Tamil Nadu The State Industries Promotion Corporation of Tamil Nadu Limited (SIPCOT) (), Limited is an institution owned by the Government of Tamil Nadu. The State Industries Promotion Corporation of Tamil Nadu Limited (SIPCOT) was formed in the year 1971, to promote industrial growth in the State and to advance term loans to medium and large industries The Functions of State Industries Promotion Corporation of Tamil Nadu Limited (SIPCOT)