Trains that are running will start later on Saturday morning and finish much earlier than usual, with services typically running between 7.30am and 6.30pm on the day of the strike.
Rain, which is expected to be heavy at times, is set to hit parts of south Wales and southwest England between 2pm on Saturday and 3am on Sunday.In Wales Cardiff, Swansea and Carmarthen are among the areas that could be affected, while in England Plymouth, Southampton and St Austell could be affected.
The Met Office said:"Rain is expected to develop across south Wales and south-west England during Saturday afternoon, moving slowly east to clear most areas early on Sunday morning. "Although the most persistent rain is expected over hills, periods of heavy rain are expected almost anywhere. 15 to 25 mm is expected quite widely, with some places seeing 40 to 60 mm of rain, particularly over hills in south Wales and south-west England.Twitter
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