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When David Lewis heard the news of the Grayrigg train disaster in which 86 people were injured and one woman was killed, he knew instantly what had happened. He had forgotten to check the points. Overworked, he had simply overlooked the vital task. He had warned his bosses there was too much to do. It's a burden he has carried ever since. The stress has cost him his marriage. But now an extraordinary friendship has developed between David and the family of Margaret Masson who died in the crash. Inside Out followed David on an emotional journey to be reunited with the family who now say they are proud to know him.

Also, on the eve of decision day for a controversial incinerator project in North Yorkshire, Inside Out looks at the arguments - and asks whether the �1.4 billion scheme will provide value for money. And Kirsten O'Brien takes to the sea off the Northumberland coast to find out if we should do more to protect visiting dolphins.