Chennai is one of the early cities in India to make use of the existing broad gauge railway tracks for the suburban commuter trains. Most of these trains are powered by an all electric engine, and it reaches till Villupuram in the South which is located ~150 kilometers from Chennai. There are everyday/weekend travelers who take these trains for work. This table of information below would be of help if you are ever planning to visit any of the southern suburbs of Chennai. All these are departing times from Tambaram.
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