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Restoring Barmouth Viaduct

We’re upgrading the iconic Barmouth Viaduct

We are carrying out the biggest restoration of Barmouth Viaduct in its history. Our £30m upgrade will protect the well-loved bridge for generations and maintain its magnificent appearance.

At over 150 years old, the viaduct is in poor condition. Many of the timber elements of the viaduct have decayed significantly over time and a large proportion of the metallic elements have corroded.

What the work will involve

Our programme will see us completely restoring the viaduct in a way that doesn’t threaten its industrial heritage and its Grade II* listed status. This means that we will replace its components on a ‘like-for like’ basis so that it retains its magnificent appearance. We will be carrying out additional work during our £30m restoration to the iconic landmark, including replacing all the timber main beams.

To reduce the impact of our work, we’ve carefully planned for it to take place over three years.

Barmouth Viaduct closures

We are sorry for any disruption our work will cause, but there is simply no safe way to carry out the restoration without closing Barmouth Viaduct and the adjoining walkway.

During the closures, you will not be able to walk, cycle or get a train over the viaduct.

Work in 2021 is being extended after engineers found damage to the historic timber structure was more extensive than anticipated.

The railway will now reopen on 29 December, 17 days later than planned, so engineers can safely carry out the extra repairs. The walkway will temporarily reopen on Christmas day until 9 January to allow pedestrians to use it over the Christmas period.  It will close again on January 10 and reopen in mid-February. The longer closure of the walkway will allow us to repair and replace any elements of the walkway and handrailing of a safety critical nature. 

Passenger disruption

  • Our colleagues at Transport for Wales will be providing rail replacement services during the closure between Pwllheli and Machynlleth stations, and all stations in between.
  • There will also be an additional bus service for local school pupils to take them to and from school during the closure.

Our advice for passengers, pedestrians and cyclists is to plan ahead and allow additional time for travelling. We’ve worked closely with Cadw, Gwynedd County Council and other stakeholders over a number of years to develop and agree our plans. For further information about our work, please download our frequently asked questions:

Get in touch

If you have any additional questions or concerns about this work, please call our dedicated 24-hour national helpline on: 03457 11 41 41 or email

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