The Rail Accident Investigation Board (RAIB) has said it is to investigate a railway embankment failure in Leicestershire that lead to the derailment of a freight train and closure of the line for 10 days.
Seven waggons carrying aggregates were derailed when the 20 wagon train passed over the failed embankment during the early hours of 27 December. No one was injured in the accident.
According to RAIB, another unladen freight train had passed over the same track two hours before but a survey of the site suggests that the landslip was already progressing at this time.
RAIB has said that its investigation will look at the management of the earthworks as well as the significance of the heavy rainfall in 2012.