Transport for Wales (TfW) is introducing an emergency rail timetable over fears a spike Omicron Covid cases will hit staffing.
The new variant has led to a surge in cases in London and Scotland in recent weeks and while numbers remain relatively low in Wales they are doubling every two to three days.
TfW said Covid-19 staff absences had already doubled since the start of December and they were preparing for a further expected rise in staff shortages with a new timetable from tomorrow.
It will see services cut by between 10% and 15% and comes as many will be heading home for Christmas - with TfW already under-fire for over-crowding at peak times on some key routes.
This will affect 43 services on weekdays and 94 services on Saturdays (although Saturday is not relevant this week due to Christmas Day and only partly the following week as there are no services on the Core Valleys Lines in South Wales on New Year’s Day.
A spokesman said: "Whilst the company will continue to offer a significantly greater level of service compared to during the start of the pandemic in 2020, the new timetable will mean a marginal reduction in services. This equates to between 10-15% of the current timetable and is designed to reduce late notice cancellations as much as possible. It is aimed to provide customers with more reliability, allowing them to plan their journeys effectively over this important period.
"Furthermore, the first, last and busiest services will continue to operate wherever possible. There will also be no change to the current level of service provided on the Sunday timetable.
"The new timetable will remain in place over the coming weeks and will be reviewed regularly as the rail industry in Wales monitors the impact of the new Omicron variant on staff levels."
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All customers are urged to check before travelling and follow the up-to-date guidance from the Welsh Government.
Colin Lea, TfW Planning and Performance Director said: “We are still very much dealing with a pandemic and have seen a major rise in colleague absences over the last few weeks. Since the beginning of December, the number of rail colleagues absent due to COVID 19 has doubled and this will continue to rise with the ongoing risk of the new Omicron variant.
“It’s fundamental we continue to run as reliable a service as possible for our customers and therefore we are introducing a new timetable from Wednesday 22 December, reducing the risk of late notice cancellations.
“Wherever we can, we’ll use any additional carriages made available due to the reduced timetable to run longer trains than normal, to aid with social distancing and provide supplementary road transport, when possible.
“We appreciate this will be frustrating for some customers, and we have not taken this decision lightly. We ask that all customers check online before they travel and follow all advice from Welsh Government.
“I’d also like to thank all our colleagues who are continuing to work in difficult conditions.”
Rachel Heath, Network Rail’s Operations Manager for Wales & Western, said: “Our colleagues are working very hard in very challenging circumstances and are dedicated to keeping the country moving, as they did during the height of the pandemic.
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“However, we are currently dealing with high levels of sickness across the rail industry due to the virus which, unfortunately, means we may have to make difficult decisions, at short notice, that impact rail services.
“We will continue to give clear and timely updates on any changes that might affect passengers’ journeys and we ask that everyone checks their journey before travelling.”
Customers who have already purchased tickets for services affected by this change will be able to use their tickets on alternative TfW rail services or cancel and get a refund.
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