The Airport station connecting to the suburban railway network is 'Tirusulam': The Southern Railway (tel: (044) 600 003 - or visit: indianrail.gov.in ) suburban railway station Tirusulam is just outside of the Airport.. Trains connect there to Egmore Station in Chennai, departing every 20 to 40 minutes - early morning to late evening. The trip takes about half an hour.
NOTE: Chennai City is now connected by the new Metro Rail Service on elevated track with a 27-mile network and 32 stations-long elevated track (connecting Alandur to Kayambedu in only 15 minutes). It will eventually run between two city corridors - Washermenpet to Chennai Airport, and Chennai Central to St. Thomas Mount. Also, the Tirusulam surburban trains merged with the Metro to the Airport.
By Bus: Note that the total distance between the Chennai Airport and the State Bus Terminal is about 14 km and it takes about 20 minutes to reach. Private cabs, taxis & buses shutte between them.
The bus stop for public Bus 18A departing frequently to Central Chennai (a 45-minute trip) is located outside of the airport gate - a lengthy walk. Bus 18A departs frequently for central Chennai.