Network Rail Director Mick Carne said the planned £38 billion upgrade to Britain's railways will improve the resilience of the system and the service for passengers.
Speaking to Consumer Editor Chris Choi he said the investment announced today was vital, and that he was "very conscious of the fact" that Network Rail "had a better job to do".
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Inspectors found the availability of drugs at HMP Bedford was having a "serious impact" on safety.