National Rail said a landslip between Hereford and Abergavenny stations means lines are closed.
Trains running between these stations will be cancelled. Disruption is expected to continue until midday today (November 25).
Limited road transport is place and is subject to road conditions. Transport for Wales is advising customers not to travel.
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Tickets dated for yesterday, November 24, will be valid for travel today, November 25, according to National Rail.
A spokesperson for Transport for Wales said: “The safety of our customers and our colleagues remains our absolute priority and we must ensure the network is safe to operate services.
“Because of the extreme weather caused by Storm Bert we’re urging our customers to check before they travel to ensure the service is operating. I’d like to thank our customers for their understanding and patience.”
