There are delays of up to 30 minutes on Arriva Trains Wales and Crosscountry services between Gloucester and Newport because of flooding at Lydney.
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Fire crews have been responding to reports of flash flooding in Carmarthenshire. Some homes have been affected.
Medication designed for animals was taken from the building in Abertillery on Thursday night.
More than a thousand riders will be taking part in a series of events in and around the town.