A man's had fifteen thousand pounds in cash stolen from him, as he travelled on a train between Liverpool and Runcorn.
The 45 year old was on his way to Stafford to buy a car, and had the money in a bag next to him.
He fell asleep and as the train arrived at Runcorn, another man grabbed it and quickly left carriage.
The theft happened on the 1st of March but police have only just released the information - along with a CCTV image of the suspect.
DC Dominic Wilcox said: “The man had planned to travel to Stafford to purchase a car – and was carrying the cash in a bag.
“The victim dozed off and as the train arrived at Runcorn, a man grabbed the bag from the seat next to the victim and quickly left the train.”
Enquiries conducted following the incident have enabled detectives to isolate the image of a man they believe has key information.
DC Wilcox added: “We are convinced the man captured has vital information about the incident and call on anyone who recognises him to come forward.
“We would also like to hear from anyone with further information about the theft.”
If you have any information about the incident, please call British Transport Police on 0800 40 50 40 or ring Crimestoppers, anonymously, on 0800 555 111.