Two people were seriously injured when three carriages came off the tracks
A rail track defect existed in the area where a train derailed near Lewes, East Sussex last week, the Rail Accident Investigation Branch says.
Twenty people were injured, two seriously, when the train came off the tracks on 13 August.
About 150 people were on board the train, which was travelling between Haywards Heath and Lewes.
Network Rail and Southern Rail said three carriages “derailed and slid part-way down the embankment”.
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