 This resulted in Network Rail taking all track maintenance back in-house and the industry went on to enjoy the longest period in modern times without a fatal accident due to industry error.This came to an end in February 2007 when a Virgin Trains West Coast Class 390 "Pendolino" derailed near Grayrigg in Cumbria, killing one person.The cause of the accident was identical to that in Potters Bar nearly five years earlier – once again calling into question Network Rail's maintenance procedures.