 The RAIB report noted that the Network Rail New Measurement Train ran over the site on 21 February . This train uses lasers and other instruments to make measurements of the track geometry and other features such as overhead line height and stagger , and the track gauge , twist and cant . It is not used to inspect points , but it does make a video record of the track which can be reviewed later . Commenting on the possibility that the train 's video might have been used to detect the points damage and thereby prevent the accident , a Network Rail spokesman said : 
