Three persons were arrested after92 tortoises were found on a train at the Howrah railway station on Saturday, police said.The tortoises were found on the down Howrah-Jodhpur Express, which was waiting at platform number 8 of the station's old complex, they said.The tortoises were found during routine security checks.Police suspect that the tortoises were being transported for smuggling.A case under relevant sections of the Wildlife Protection Act has been filed, they said, adding that further investigations are underway.