Railtrack subsequently went Self_motion into administration Reforming_a_system and was replaced by Network Rail .

In 2005 , both Railtrack and the contractor Balfour Beatty were found Coming_to_believe guilty of breaching health and safety laws .

The passenger train operating Being_in_operation company had contravened Hindering the rules in failing to inform Telling Railtrack and the signaller that the safety system was inoperative .