The male ferret, named Mickey by Scottish SPCA staff, was found by workers at Edinburgh’s Haymarket train station yesterday evening (Mon) just after the train from London departed the station.
It is not yet clear if he has escaped from a home nearby or if he travelled from England on the train.
The Scottish SPCA is now looking to reunite the pet with its owner.
Senior Inspector Jenny Scott said: “When I arrived to collect the ferret the staff had managed to catch him and put him in a box.
“He appeared on platform four at about 7pm when the train from London was in the station.
“We’re not sure if he has escaped from someone’s house nearby or if he has ventured further and travelled all the way from England on the train.
“He’s very friendly so he is obviously someone’s pet.
“We’d love to return him to his owner as I’m sure they’ll be missing him a lot.”
The ferret is now being cared for at the charity’s animal rescue and rehoming centre at Balerno.
A ScotRail spokesperson said: “We think it must be someone’s pet as it seemed tame. We hope that someone comes forward to collect it.”
Anyone with information about the ferret is asked to contact the Scottish SPCA animal helpline on 03000 999 999.