South Wales resignalling

We’re delivering a £450m scheme to modernise the railway in South Wales – the biggest investment in the Welsh network for more than 100 years.

Alongside our scheme to electrify the Great Western Mainline to Cardff, we’re installing new signalling technology. Together, these projects will create more capacity and deliver a more robust and reliable railway service for passengers.

More reliable journeys

We’re removing out of date and old signalling equipment and replacing it with state-of-the art signalling technology that will allow more trains to run along the track and so increase passenger capacity, particularly at peak times.

The multi-million pound project commenced in 2007, with a number of major phases now complete.

To date we have reached the following major milestones:

  • Resignalled the line in the area east of Port Talbot, from Llantrisant to Baglan, and in the Newport area from Pilning to Newport station.
  • Completed resignalling on lines in the Valleys and in the Cardiff area from Newport station to Llantrisant through the Cardiff Area Signalling Renewals scheme (CASR) which completed in January 2017 and has given the capacity to see 16 trains per hour into Cardiff Central station (increased from 12)
  • Commenced work on installing new signalling equipment in the area west of Port Talbot from Baglan to Swansea (due for completion in 2019).
  • Six new platforms to give provision for more trains into and out of Cardiff Central (Tirphil, Caerphilly, two at Cardiff Queen Street, Cardiff Central and Barry)

The signalling technology is controlled from our Wales Railway Operations Centre at Cardiff Central station, which we completed and opened in 2010.

Timeline of signalling upgrade work:

Electrifying the South Wales route

Our upgrade of signalling and stations paves the way for electrifying the South Wales route. Electric trains are faster, quieter and greener than diesel trains, with 20 to 35 per cent lower CO2 emissions. They are also cheaper to run because of lower fuel and maintenance costs.