In a major breakthrough, chemicals responsible for the "black ice" of the railways that often lead to train cancellations in autumn and winter have been discovered.
Researchers from the Universities of York and Sheffield identified the chemical processes that enable leaves to form slippery layers on railway lines - an issue that has long caused chaos for rail passengers and train companies.
Now the team at York University is focussing on enzymes to digest leaf layers on the track.
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A woman has denied causing the death of a man by dangerous driving at a country crossroads near York.
