Jambukeshwar temple is near srirangam/trichy. Plenty of trains available from CDM to TPJ. Plenty of buses available from Trichy/Tiruchirappalli to Jambukeshwar Temple.
You can also board direct Trichy bus from Chidambaram which is approximately 1km from CDM Rly station. Pls refer arasu bus website for TN BUS timings.