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Four Southeastern trains are delayed by up to two hours every day, according to new data.
The services affected were branded "significantly late" by the Office of Rail and Road (ORR) for arriving between 30 and 119 minutes after the advertised arrival time.
The figures, covering the period from July to September 2015, account to one in 471 of the company's services.
It follows analysis of the performance of every train operator in Britain, including the percentage of trains that arrived significantly late and the average number late per day.
Southeastern have been contacted for a comment.