ScotRail passenger could face charges over train row
14 December 2011 Last updated at 13:48 GMT
A train passenger, who manhandled a student off a train after he swore at the ticket inspector, could face prosecution.
Alan Pollock, from Stirling, was filmed intervening in a dispute between a train conductor and a 19-year-old on-board a ScotRail service between Edinburgh and Perth.
The footage has been viewed on YouTube more than a million times.
James Cook reports.