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Network Rail needs to do a "massive amount" to make level crossings safer, the parent of a teenager killed by a train has told MPs.
Tina Hughes, who now works with the firm on improving crossings, said Network Rail had made changes but were only "scratching the surface" of what needed to be done.
Ms Hughes's daughter Olivia Bazlinton, 14, and her friend Charlotte Thompson, 13, were hit by a train in 2005 as they crossed the tracks at Elsenham in Essex.
Ms Hughes, who works with Network Rail as its "level crossing user champion", told MPs: "I believe that they have made very significant changes but they are only just scratching the surface of the things that they need to do. There is a massive amount of work that needs to be done."
Olivia's father Chris Bazlinton, appearing alongside Ms Hughes in front of MPs on the Transport Select Committee, said he believed information about their deaths had been covered up in a "conspiracy of silence".
Families from this region whose children were killed and seriously injured at railway level crossings have been at a parliamentary inquiry which opened in London today.
The parents of Olivia Bazlinton, who died alongside friend Charlotte Thompson at Elsenham near Bishop's Stortford, were among those to appear before the Transport Select Committee.
It is claimed that Network Rail put financial considerations above public safety.
Matthew Hudson reports.
The father of a teenager who was killed at a level crossing in Essex has accused Network Rail of a cover-up - as he prepares to speak at a parliamentary inquiry later today.
Chris Bazlinton's daughter Olivia died with her friend Charlotte Thompson in Elsenham eight years ago.
Today he will join the grandfather of a boy who was badly injured at a crossing in Beccles, Suffolk, in front of the Transport Select Committee this afternoon. The inquiry will look at safety at level crossings.
Today Mr Bazlinton said he wanted to know why key documents linked to the investigation into his daughter's death were not made public sooner.
Network Rail says it has promised the families it is committed to making the railways as safe as possible.