Teasing sparked singsong
Ryan Girdwood, 18, was arrested on August 11 after he ran through a train which had stopped at Waverley Station singing the Billy Boys.
Edinburgh Sheriff Court was told that a Celtic fan had been insulting Girdwood about how bad Rangers were after they drew against Peterhead.
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Hide AdGirdwood, of Livingston, West Lothian, responded by chanting the offensive anthem. He yesterday pleaded guilty to breach of the peace and was fined £100.
Depute procurator fiscal Bruce Macrossan told the court that Girdwood was on his way home from watching the match on TV in a city pub. He said the first offender lost his temper.
Defence solicitor Euan Roy said his client was sorry for committing the offence.