Video. Phil and Stacey have spoken to Andrew Britton, a steam train fan who has written a book called "Waterloo to Weymouth: A Journey in Steam" about one of the last active steam lines in Britain.
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So how hot is it across Wales? Well official weather temperatures show we're basking in summer conditions not seen for ten years.
The Met Office has today issued a Level 3 Heatwave Alert for the South East Region
Wednesday afternoon's weather for the east of the region