Potters Bar train crash

10 May 2002: Members of the emergency services work at the scene of the fatal Potters Bar rail crash Photograph: Dan Chung/Reuters

The fourth carriage of a derailed train at Potters Bar station Photograph: Nicolas Asfouri/AFP

A body is removed from the wreckage at the scene Photograph: Peter Jordan/PA

The train was derailed at the station en route from King's Cross to King's Lynn, killing seven people Photograph: Michael Stephens/PA

Transport police examine an area of track near to the crash site Photograph: Russell Boyce/Reuters

A carriage of the train involved in the fatal Potters Bar rail crash is seen on its side at the station Photograph: Dan Chung/Reuters

Emergency workers on the tracks, six of the dead were passengers while the seventh was someone walking nearby Photograph: Nicolas Asfouri/EPA

Railway workers watch as attempts are made to remove a railway carriage from Potters Bar station Photograph: Andrew Parsons/PA

Railtrack Engineers work on the track where the points were, before they were removed in May 2002 Photograph: Andrew Parsons/PA

The wrecked train carriage wedged beneath the platform roof is removed by a crane Photograph: Stephen Hird/Reuters

Points that may have failed causing the crash Photograph: Hertfordshire County Council/PA