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3. Rail Accident Investigation Branch, Autumn Adhesion Investigation Part 3: Review of adhesion-related incidents Autumn 2005 (RAIB Report), 2007.
4. Wheel/rail adhesion-boundary lubrication by oily fluids;Beagley;Wear,1975
5. Wheel/rail adhesion - the overriding influence of water;Beagley;Wear,1975