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Reports on the speed restrictions imposed on parts of Great Britain's railways due to heatwave. Restriction as a step to limit the dangers of rails buckling under high temperatures; Expansion of steel under high temperatures leading to buckling; Accommodation of expansion through lateral movement.

Deals with a theory regarding cracks in the rails of Great Britain's railway system. Testimony made by Richard Middleton of Railtrack PLC at the House of Commons transport subcommittee on the effect of harder steel on rails; Description of the rolling contact fatigue problem of the country's railway system.