South Wales electrification

Work to electrify the South Wales Mainline – an important rail route linking major towns and cities – is well underway.

We are electrifying the line between London and Cardiff – a major part of our Railway Upgrade Plan. This will result in the introduction of bi-mode trains – trains that can run on electric and diesel – providing extra seats and faster services for thousands of passengers and a quieter and greener environment for lineside neighbours. The South Wales Mainline runs from the Severn Tunnel in Monmouthshire, through Newport, Cardiff, Bridgend, Port Talbot, Neath and Swansea.

In some areas between Severn Tunnel Junction and Cardiff Central station, elements of our work are nearing completion but in others, there is still a lot of outstanding work to do. We will be working hard in the coming months on a range of activity, including:

  • Piling - installing the foundations that will support the overhead line equipment. Find out more information about piling.
  • Erecting masts and overhead wires which will carry the electricity to power the new trains.
  • Managing vegetation either side of the track.
  • Installing or renewing fencing along the railway.
  • Testing the new equipment before it comes into use.

Upcoming work

Saturday 23 March – Friday 29 March 2019

Piling will be undertaken in the following locations:

  • Magor (Monmouthshire)
  • Somerton, Maindee, (Newport)
  • Rumney, Pwll-Mawr, Pengam, Riverside (Cardiff)

Erecting mats and overhead wires will be undertaken in the following locations:

  • Severn Tunnel Junction – Bishton (Monmouthshire)
  • Llanwern - St Brides (Newport)
  • Pengam- Ninian Park station (Cardiff)

We are well underway with our work to electrify the South Wales mainline with examples of our work below:

Examples of our work

Image 1: Cardiff Central station at Christmas 2018

Image 2: Preparing the approaches to the Severn Tunnel

Image 3: Cardiff Central approaches preparing for overhead line equipment.