http://news.bbc.co.uk/1/hi/scotland/8336485.stm
A following Fife loop service along with NXEC's 1F23 to Aberdeen were delayed by around 90 minutes behind the Voyager, but other services were able to be diverted via Dunfermline.
A 24-year-old football fan dressed as a sheep suffered serious burns to his arms and legs when he was set alight on a train in Fife.
Aberdeen fans said the man ran through the carriage on fire as others threw beer on him to douse the flames.
The Edinburgh to Aberdeen service was stopped at Kirkaldy at about 1900 GMT to allow the man to be treated.
British Transport Police said one man was arrested and another was assisting the police with their inquiries.
A second man is reported to have suffered slight injuries.
The train was carrying Aberdeen football supporters back home after their side's match again Hibs in Edinburgh.
It is understood a number of the fans at the match and on the train were dressed as sheep.
The train involved, an Arriva cross-country train was the 1808 GMT service from Edinburgh to Aberdeen.
A British Transport Police spokesman said: "British Transport Police can confirm that a male has been arrested and another is assisting with enquiries following a serious incident on board a train in the Kirkcaldy area of Fife at around 1900 hours yesterday."
The spokesman added: "British Transport Police are treating the incident very seriously and investigations are currently ongoing."
A following Fife loop service along with NXEC's 1F23 to Aberdeen were delayed by around 90 minutes behind the Voyager, but other services were able to be diverted via Dunfermline.