Rail nuts 'were already loose'
	The Health and Safety Executive have also discovered that the same set of points had needed attention several days before the crash. The BBC's Gavin Hewitt reports.

Related News:

	BBC News Online special: Potters Bar crash
	The BBC's Duncan Kennedy reports on the human cost of the crash at Potters Bar
	Rail passenger Kevin O'Neill contacted safety officers and BBC News Online after experiencing "white knuckle rides"
	Railtrack chief executive John Armitt says he could find no record of workers' concerns over the points at Potters Bar
	Railways Inspectorate acting head Dr Allan Sefton: "There is no evidence that this is a generic problem"
	RMT secretary general Bob Crowe says complaints have been made about the bad state of the track in the Potters Bar area