A passenger train overshot its intended station in East Sussex by almost two-and-a-half miles.
The Southeastern London to Hastings train was travelling at 65mph when it encountered "poor adhesion conditions" as it went through Stonegate station.
The Rail Accident Investigation Branch (RAIB) has begun an inquiry into the incident which took place on 8 November.
The train also went through a level crossing which operated normally.
Unable to stop
The RAIB said: "The train encountered poor adhesion conditions as its driver applied the brakes to make the scheduled stop at Stonegate station, while travelling at about 65 mph.
"The train was unable to stop at Stonegate, and came to a stand some 2.45 miles beyond the station."
The train left Charing Cross station at 0645 GMT and the incident took place at about 0810 GMT.
The RAIB said that no signals had been passed at danger during the incident and the train driver had contacted the signaller by radio to report the situation.
The investigators said they would identify the reasons for the train's inability to stop.