The Rail Accident Investigation Branch (RAIB) is investigating an incident in Twickenham, south London, in which a passenger train hit equipment that had been left on the tracks.
The incident occurred at about 05:55 on 8 September 2021. A passenger train that was travelling between Staines and London Waterloo struck an engineering trolley on its approach to Twickenham station.
The trolley had been left on the line following overnight engineering work. No injuries were reported.
When it has completed its investigation, the RAIB will publish a Safety Digest covering the incidents and lessons to be learned.