British Transport Police (BTP) is trying to trace the owner of a dog that bit a passenger on a train from Exeter to London in the run-up to Christmas.
Officers have released a CCTV image of a woman with the dog, after the incident on a Penzance to Paddington service on Sunday, 21 December 2014.
PC Bob Edwards said: "A 72-year-old woman boarded the 8.30am Penzance to Paddington service at St Erth, and sat in coach D. A woman with a dog were sitting nearby.
"A short time, later the first woman left her seat to get a hot drink from the buffet car. When she returned, she was bitten on her leg by the dog.
"She went to the toilet to examine her injuries, which required a tetanus vaccination. The woman and dog had gone by the time she returned to the carriage. The victim, from the west of Cornwall, suffered visible bite marks and bruising.
"I want to speak to the woman pictured in the CCTV images. It is believed she boarded the train at Redruth and alighted at Par. I would urge her to come forward, as I want to speak to her about what happened that day.
"If you recognise her, or her dog, please get in touch."
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference B3-GSUB of 15/01/2015. Information can also be passed anonymously to the independent charity, Crimestoppers, on 0800 555 111.
