A privately-run railway station in Chinnor was the subject of an arson attack in the early hours of Thursday morning which was spotted by a police helicopter.
Police are appealing for witnesses to the arson which happened at about 2am.
The police helicopter discovered the fire near a private railway station belonging to the Chinnor and Princes Risborough Railway Association, which is a registered charity.
Police officers and the fire service attended and dealt with the incident. The fire destroyed an historic carriage which was on railway sidings some distance away from the station.
An investigation has been launched and officers are working closely with the charity to keep them fully informed.
Investigating officer PC Martin Davis, of Thame police station, is appealing for witnesses to come forward.
He said: “This railway is run entirely by volunteers so this incident has caused a great deal of upset.
“We are currently treating the incident as arson and would like to appeal to anyone who saw people acting suspiciously in the area of the railway station in the early hours of this morning, to come forward. I would also like to speak to anyone who has any further information which could assist our inquiry.”
If you can help, please call PC Davis via the 24-hour Thames Valley Police Enquiry Centre on 101.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org. No personal details are taken, information is not traced or recorded and you will not go to court.