An unlikely friendship made out of Grayrigg rail tragedy
29 October 2012 Last updated at 09:32 GMT
When a Virgin train travelling at 95mph derailed near Grayrigg in Cumbria five years ago dozens of passengers were injured and one woman was killed.
Five years on an unlikely friendship has developed between the son of the woman killed, George Masson, and the engineer who was accused of failing to check the tracks properly, David Lewis.
Speaking to BBC Breakfast, George said of David, "He was the only one who showed any sincerity, emotions, remorse."
BBC Inside Out's film of Dave Lewis and George Masson's story will be shown on BBC One on Monday, 29 October at 19:30 GMT and afterwards on the BBC iPlayer.