There is disruption to many services outbound from Cardiff Central Station due to a landslip.
Delays have been reported on many First Great Western lines including services between Swansea and London Paddington, between Cardiff Central and Taunton and between Cardiff Central and Portsmouth Harbour.
Arriva Trains Wales are also reporting problems between Cardiff Central and Cardiff Queen Street, between Cardiff Central and Penarth and between Cardiff Queen Street and Cardiff Bay.
Trains between Cardiff Queen Street and Cardiff Bay will not run at the present time.
Other trains to and from Cardiff Central running via Cardiff Queen Street are being altered or running additional services.
All other Arriva Trains Wales services are running normally.