Railway Police DSP Rajavel told reporters that N.Nagarajan (40), a native of Tiruvarur, was arrested for making a call on July 3,claiming that a bomb had been planted in the Chennai-bound Vaigai Express from Madurai.
Nagarajan had used a SIM card to make the call and later destroyed it.
Police managed to track down the accused on the basis of documents he produced while buying the SIM card.