Network Rail has announced that flash floods aftermath heavy downpour has washed away parts of the track between Abergavenny and Hereford.
The fast flowing water had washed away the foundation stone of the railway, which left some parts of the track suspended.
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According to the Met office, some regions received 100mm of rain on 26 October.
In a release, Transport for Wales stated that the line between Clarbeston Road and Fishguard Harbour will be closed due to unsafe trees until 15 November.
Services between Hereford and Newport South Wales have also been closed till 1 November.
Delays and further cancellations are expected on other rail services for the next few days. Passengers have been advised to check the websites before travelling.
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By GlobalDataA Network Rail spokesperson said in a release:“We understand how disruptive the closure of the Marches line will be to passengers and we’ll work as fast as we can to get it back up and running again.
“Although we always plan for extreme weather it’s nearly impossible to mitigate such heavy rainfall of the like we’ve seen over the last 24 hours.
“We thank passengers for their patience while we make our repairs and advise them to check National Rail Enquiries to find alternative routes while the Marches line remains closed.”
Transport for Wales added that it has made required arrangements to ensure passengers can travel to their destinations.
Replacement buses for rail services have started between Newport and Hereford.
Additionally, many roads in Wales have closed and flood warnings have been issued.
Earlier this month, Typhoon Hagibis caused widespread destruction in Japan and led to disruption of train services.
