The monk was on board of the Thamilnadu Express.The attack took place as the train arrived at the Chennai Central railway station.
This is the second attack within three days.
A Buddhist priest was previously attacked in Trichi.
A Police officer who spoke to the ‘Hindu’ said that the monk was slapped beaten on the leg and spoken to abusively.
A Tamil television film crew has filmed the incident and one suspect has been identified.
The monk had been escorted to the Mahabodhi society office in Egmor.