Inquiry after person injured in Charing Cross accident
An investigation has begun after a member of the public fell down a gap between a train and the platform, suffering "life-changing" injuries.
The incident was captured on CCTV at Charing Cross main line station in central London on 24 November.
The train travelled for 39m (127ft) before a passenger alarm was activated and it stopped.
The train was the 22:26 GMT South Eastern service to Dartford.
The Rail Accident Investigation Branch (RAIB) said its preliminary investigations showed the member of staff on the platform had carried out their duties correctly.
It said there was no guard on the train so its departure was controlled by the staff member, who "acted promptly to try and stop the train".
The spokesman said: "A particular focus of the investigation will be an assessment of the measures that the railway industry has in place to enable staff to respond to an event that occurs late in the process of dispatching a train, and the scope for improvement."