Network Rail said services operating in the Met Office’s red and amber zones should only be used ‘if absolutely necessary’

Britain is bracing for a record-breaking heatwave this week

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‘Only travel if absolutely necessary,’ said Network Rail

Record-breaking temperatures of 40C set for Britain on Wednesday

The warning for extreme heat covers an area stretching from London to Swansea

Museums, parks and zoos will be closed across the country due to the temperature

Steel tracks risk buckling during periods of extreme heat