Rail passengers travelling between Newport and Cardiff Central face significant disruption this March as Network Rail undertakes major upgrades on one of the busiest sections of the South Wales Main Line.
The essential engineering work — running Monday 16 March to Sunday 22 March — includes extensive track renewals designed to maintain rail safety and improve long‑term reliability for both passenger and freight operations.
🚆 Weekday Service Changes
During the week, services operated by Transport for Wales (TfW), GWR, and CrossCountry will be affected due to reduced track availability. Timetable alterations are expected throughout the period, and passengers are strongly advised to plan ahead.
🚧 Full Line Closure: 23:00 Friday 20 March – 05:00 Monday 23 March
A full railway closure between Newport and Cardiff Central will take place over the weekend to allow engineers to complete the most intensive phase of the track renewal.
During this period, a comprehensive rail replacement bus service will operate.
Passengers can check up‑to‑date travel information via:
- The TfW app or website
- GWR and CrossCountry websites
- nationalrail.co.uk
Additional Disruption: Cardiff Queen Street – Cardiff Bay (22 March)
Separate engineering work on Sunday 22 March will impact several Valleys Line services, with replacement buses deployed across affected routes.
Nick Millington, Route Director for Network Rail Wales and Borders, said:
“Renewing the track between Newport and Cardiff is essential to keeping this busy stretch of railway safe and reliable for the passengers and freight services that rely on it every day.
“We’ve worked closely with our train operating partners to keep services running during the week, with some timetable alterations, while carrying out the most intensive work over the weekend.”
“We know this will affect journeys and we apologise for the disruption it may cause. Our teams will be working as quickly and safely as possible to complete these vital upgrades, and we thank passengers for their patience while we carry out this important work.”
Colin Lea, Planning and Performance Director at TfW, added:
"We’re encouraging all passengers travelling between Cardiff and Newport to check their journey in advance, as many of our services will be affected throughout the weekend. This includes trains to Manchester, Holyhead, Cheltenham, Ebbw Vale, Maesteg and some Valleys services on Sunday.
To help keep passengers moving, we’ll be running a comprehensive rail replacement bus service, with buses operating roughly every five minutes between Cardiff and Newport. Our teams will be on hand throughout the weekend to support customers and help them reach their destination.”
Kay Davies, GWR Station Manager for South Wales, said:
“We apologise for the impact this work will have on customers, but this is a really important investment in the long-term reliability of our railway.
“Timetables have been amended for these dates to reflect the change to services, including a reduced train service between Cardiff Central and London Paddington.
“If your usual train is affected, replacement buses will be running, but please allow extra time as bus journeys will take a little longer than the train.”
Image credit: Network Rail & Istock
