British Transport Police have issued CCTV images of their most wanted suspects in Yorkshire.
Today, it launched its Operation Impact campaign to stop thefts on trains and catch those responsible.
Officers want to speak to the men pictured about a number of thefts on trains to and from Westgate and Kirkgate Railway Stations.
Chief Inspector Glen Alderson said: “Officers investigating each of these cases have followed a number of lines of enquiry and circulated the images but so far without success.
“We’re now asking for help from members of the public. If you know any of these people and can tell us who they are, we want to hear from you.
“Our intelligence shows that thieves travel to commit crimes.”
Anyone with any information should contact BTP on 0800 405040 or Crimestoppers, anonymously, on 0800 555111.