 As part of the investigation by the British Transport Police , three Network Rail employees were arrested and bailed , one in July 2007 and two in November 2007 All three were due to answer bail in March 2008 but this was extended until the end of June pending further inquiries . On 9 February 2009 , the British Transport Police confirmed that none of the three Network Rail employees arrested in connection with the derailment will be charged following advice from the Crown Prosecution Service . 
