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The Great Western electrification project includes work to the South Wales Mainline – an important rail route linking major towns and cities across the region

The South Wales Mainline runs from the Severn Tunnel in Monmouthshire, through Newport, Cardiff, Bridgend, Port Talbot, Neath and Swansea.

We began work at the eastern end of the South Wales Mainline, in Monmouthshire, in spring 2015.

Map of planned bridge works in Monmouthshire (320 KB)
South Wales electrification FAQ (2.2 MB)

See the Great Western Mainline page for information about the benefits of the project for passengers, the economy and the environment.

As part of our plan to electrify the South Wales Mainline, we have identified that a number of bridges in Monmouthshire will require modification as they are too low to accommodate the overhead lines.

Bridge and structure works – Monmouthshire

StructurePlanned worksProposed start dateProposed end dateAdditional information
The Ramp / Huggets Road bridgeReconstructionSeptember 2016Spring 2017We expect the road will be closed for approximately six months. Exact dates TBC. Access to Undy will be maintained during the works via Church Road / Robert Road bridge
Llandavenny Road bridgeReconstructionSeptember 2016Summer 2017We expect the road will be closed for approximately six months. Exact dates TBC.
Church Road / Roberts Road bridgePart reconstructionOctober 2015Spring 2016The work will involve the reconstruction of one section of the bridge and installation of new parapets (side walls). This work will involve a road closure from 16 November 2015 to Spring 2016. Access to Undy will be maintained during the works via The Ramp / Huggets Road bridge.

We will also undertake works to lower part of the track under this bridge in 2016.

Church Road Bridge Reconstruction May 2016 newsletter
Church Road Bridge Reconstruction February 2016 newsletter
Church Road Bridge Reconstruction December 2015 newsletter
Magor / Redwick Road bridgeTrack Lower TBC TBCWe anticipate lowering the track under this bridge to gain sufficient clearance. We will also undertake work to amend the parapets.
Rogiet Road bridgeReconstructionWinter 2016Autumn 2017We expect the road will be closed for approximately six months. Exact dates TBC.

As part of the project, we will also clear overgrown vegetation running outside the rail. This will be carried out in spring and summer 2015.

Find out more about how and why we manage vegetation

Following the successful completion of the devegetation work, we will begin to undertake the piling works required to install foundations which will facilitate overhead electrical lines. This work will be undertaken largely at night time at intervals between late 2015 and spring 2016.

Delivering our work responsibly

We recognise that work to electrify the South Wales Mainline may cause some disruption in local communities but we’ll do our very best to limit this.

Safety is our number one priority and for this reason, some of the work must be carried out while trains are not running. Also, we are contractually obliged to work at times that cause the least disruption to services.

This means carrying out some of our improvement work during the night.

Alongside our partners, we will endeavour to work responsibly ensuring construction sites are managed effectively. For those living close to the railway, engineering work can be noisy – but we will try to keep disruption to a minimum, particularly at night time.

Undertaking work to bridges will require the temporary closures of roads and footpaths – but we are working closely with local councils to agree suitable diversionary routes and are committed to completing construction as quickly as possible.