Engineering work is taking place between Taunton and Exeter St Davids, closing some lines in the area early on Monday morning.
As a result of this work, the 05:15 Taunton to Cardiff Central service will divert after Bristol Temple Meads and will run to Severn Beach, calling at all stations.
Customers for stations towards Cardiff Central should change at Bristol Temple Meads for a separate connecting train service from Bristol Temple Meads and Cardiff Central.
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