Old catering carriages are being converted to help ease overcrowding on trains between South Wales and London. The work, being carried out in Edinburgh, will see an extra carriage per train at peak times.
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Plenty of fine dry weather to come today and prolonged spells of sunshine. A cool easterly breeze will take the edge off the temperatures.
The three-day event in the Welsh capital is expected to attract more than 20,000 visitors.
Steve Ashton's picture of a jacket potato and corned beef served to his 81-year-old mother has been shared 130,000 times on Facebook.