A miniature railway locomotive suffered damage estimated at £6,000 when it was derailed by an obstruction on the line.
The miniature train remained upright after it was derailed
The Romney Hythe and Dymchurch Railway (RHDR) locomotive and a coach were being used to conduct a survey of trees when the incident happened on Monday.
Only the driver and a tree surgeon were on board as it approached the Derville Road bridge in Greatstone. Neither were hurt and the train stayed upright.
Kent Police said a wood and metal fence panel had been put on the track.
Pc Eddie Evans said the train was regularly used by school children and members of the public and it was fortunate the locomotive did not overturn.
Anyone with any information about the incident, which happened at 0850 GMT, is asked to call police.