 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 initial conclusion of the accident investigation is 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 . 
