Transport for Wales has warned there could be further damage to the train network as torrential downpours approach.
The rail operator, which has had to cancel services across Wales recently due to Storm Ciara and Storm Dennis, said there could be even more disruption to services when heavy rain hits on Wednesday and Thursday.
They said the major disruption could impact fans heading to Cardiff for the Six Nations clash between Wales and France on Saturday.
Train lines across Wales were badly damaged earlier this month as the two named storms caused havoc, leading to services having to be cancelled.
TfW said that while many lines were now back open, the heavy rain in the coming days could lead to more cancellations.
Bethan Jelfs, the operator's customer delivery director, said: "As a result of rail and road infrastructure damage and continued flooding caused by Storm Dennis, and a weather warning for further heavy rain this week we are still strongly advising all customers to check their journey arrangements prior to travel and allow plenty of time.
“The situation is changing all the time and with further weather warnings of heavy rain on Wednesday and Thursday we strongly advise customers to check for regular updates over the next couple of days before the Wales v France Six Nations rugby international in Cardiff on Saturday 22 February.
“The rail network is significantly damaged in places and with additional damage to roads and limited replacement road transport available to us, it’s inevitable that some services will be subject to disruption which will result in delays and cancellations."
As of Wednesday morning, the Conwy Valley line remained closed, with a bus service running between Llandudno Junction and Blaenau Ffestiniog instead.
The Cambrian Line, which incorporates services from Shrewsbury to Machynlleth, Machynlleth to Aberystwyth and Machynlleth to Pwllheli, re-opened overnight.
Ms Jelfs added: "Where trains are cancelled or terminating short of destination, every effort will be made to provide a rail replacement bus service wherever possible, however with continued flooding and damage to a number of roads, journeys may take significantly longer than is usual on many routes."
"The safety of our customers and colleagues is our absolute priority and we are working closely with Network Rail and doing all we can to minimise the disruption and keep our customers moving and informed.
“The situation is changing all the time and therefore services are likely to be disrupted with last minute alterations. Customers are advised to check their journey before travelling on nationalrail.co.uk or journeycheck.com/tfwrail/
“We would like to thank customers in advance for their patience and understanding.”
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The Met Office has issued a yellow weather warning for rain in parts of North Wales, which is in place from 6pm on Wednesday (February 19) until 3pm on Thursday (February 20).
They have warned as much as 100mm of rain could fall in north-west Wales.
