The Grayrigg derailment was a fatal railway accident that occurred at approximately 20:15 GMT on 23 February 2007, just to the south of Grayrigg, Cumbria, in the North West England region of the United Kingdom. The accident investigation concluded that the derailment was caused by a faulty set of points (number 2B) on the Down Main running line, controlled from Lambrigg ground frame. The scheduled inspection on 18 February 2007 had not taken place and the faults had gone undetected.