A railway magazine writer believes repairs to a railway line in northern England will be "challenging".
An interim report by the Rail Accident Investigation Branch found a damaged wheel was to blame for a freight train coming off the tracks in Carlisle.
Tony Miles from Modern Railways Magazine said the operation to lift the damaged wagons with two containers of cement powder, which are still in the River Petteril, would be logistically difficult.
Network Rail has said the line is likely to be closed for weeks.
https://www.bbc.co.uk/news/articles/c4n2p7yle8zo