Many trains are available to reach MAS (Central Railway Station) from Perambur, and some are directly available to Tambaram. You can take any train, if you reach Chennai Centeral, From Chennai Central, reach Park station (a local suburban station to catch Tambaram bound train) which is 10min walk. At Park station, catch Tambaram bound train and you will reach Tambaram in 45 min, or you can catch direct train to Tambaram from Perambur